Up To, and Fitted For: How the Ministry of Defence Fudges a Fleet

By Mark Allatt, UK Defence First

Executive summary

Two phrases do more work in British defence than most weapons systems. “Up to” sets a ceiling and lets a minister announce the top of the range while ordering the bottom. “Fitted for but not with” builds a ship with empty space and calls the space a capability. The Royal Navy is where both habits are most visible. The Ministry still intends to procure “up to twelve” SSN-AUKUS submarines, with the number not to be fixed until 2028. The Type 31 was designed around vertical launch cells that were, for years, to be fitted later. The Type 45’s successor has become “at least six” Common Combat Vessels, a hybrid that replaces a destroyer that was itself never fully armed. UK Defence First’s view is that these are not cautious drafting. They are the method by which ambition is announced and capability is quietly reduced. A fleet that cannot leave harbour does not need another upper bound. It needs a number, a weapon and a date.

The phrases are old. “Fitted for but not with” was already a standing joke when the Type 23s were built with space for systems that arrived years late, or not at all. The Type 45s were designed for sixty-four Sylver cells and sailed with forty-eight. The shortfall was briefed as growth potential. It was also a ship that carried a third fewer missiles than the design allowed, in a class of six that was itself a cut from the twelve once discussed. A minister could say the ship was capable of the fuller fit. The Treasury could say the money had not been spent. Both statements were true. Neither produced a missile.

Up to twelve

The current version is cleaner, and worse. In the 2025 Strategic Defence Review the government said Britain would procure up to twelve SSN-AUKUS attack submarines, replacing the seven Astute-class boats. Headlines carried twelve. Allies heard an expanded force. The industrial story -a submarine every eighteen months from the mid-2030s - was told against the upper figure. The commitment was the word “up to”.

On 22 October 2026 Luke Pollard restated it in the form the department prefers. The Ministry “intends to procure up to 12 SSN AUKUS submarines.” The programme is midway through Detailed Design and Long Lead. “The number of submarines will be confirmed before the end of this phase in 2028.” Steel is to be cut on the first British boat in 2027. The first is to enter service in the late 2030s. Twelve remains an upper bound until the design phase closes. An Astute force that has spent long stretches of 2026 with no operational boat at sea is being replaced by a class whose size has not been decided.

“Up to” does two jobs. It lets the department claim the ambition of twelve while retaining the right to order seven, or eight, or whatever the next spending review will bear. It also moves the decision past the political moment. UK Defence First has argued that the submarine force is one of the few capabilities that still makes a claim to act alone credible. A force whose size is an upper bound until 2028 is not a force. It is a press line.

Fitted for but not with

The surface fleet has the other phrase. The Type 31 was ordered as five general-purpose frigates at a unit price that left little room for weapons. In 2023 the then First Sea Lord confirmed a thirty-two-cell Mk 41 vertical launch system for the class. The cells were not, for a long period, part of the build the contract would deliver. Reporting in 2024 and 2025 described a “fitted for but not with” arrangement: the ships would be built with the space, and the modules installed later during a Capability Insertion Period, so that delivery dates could be protected. A warship with empty launcher space cannot fire what the space was for.

The Defence Investment Plan has since put money towards weaponising the Type 31s, and Babcock has taken a charge for rework on HMS Venturer and HMS Active, consistent with a late design change to accommodate the cells. That is the cost of having designed the cheap ship first and the armed ship second. The fifth hull has not yet had steel cut. Affordability remains under review. The through-life support competition was discontinued in 2026. Fitted for but not with is not a technical term. It is a way of commissioning a hull and postponing the weapon.

At least six, and the ships that are not ours

The same habit appears when a programme is cancelled. The Type 83 destroyer was the planned successor to the six Type45s. It was abandoned in the Defence Investment Plan. In its place the department announced “at least six” Common Combat Vessels, hybrid ships that are to act as control hubs for uncrewed systems, with first delivery from the early 2030s. “At least six” is the mirror of “up to twelve”. One is a floor that can be read as a promise of more. The other is a ceiling that can be read as a promise of the top. Neither is a contract for a number. The Type 45s leave service on current plans between 2035 and 2038. Their replacement is a concept whose design work is only now being organised, and whose air-defence performance has not been demonstrated because the ships do not exist. A destroyer that spent 3,408 days alongside is being succeeded by a class that has not been ordered.

Norway supplies the last variant. Ministers now speak of a combined force of thirteen Type 26 frigates with Norway, eight British and at least five Norwegian. The thirteen is real as a NATO total. It is not thirteen Royal Navy ships. The Defence Committee has noted that if two Type 26s being built for Britain are transferred to meet Norwegian timing, Royal Navy frigates fitted with the Sonar 2087 towed array could remain as low as five for the next three years, and the Navy would not reach eight until 2037. The government has said the Royal Navy will still receive all eight. It has also said build slots allocated to the Navy are being assessed for Norway. Counting an ally’s hulls in a British total is the export version of “up to”.

What the phrases cost

The cost is not rhetorical. An attack submarine force whose size is undecided until 2028 cannot be crewed or docked against a known number. A frigate delivered without its vertical launch cells cannot do the task the cells were announced for. A destroyer replacement described as “at least six” hybrid vessels cannot be assumed to screen a carrier in the way six fully fitted Type 45s were meant to. Allies plan against the announced figure. The Treasury plans against the qualified one. The Navy lives with the difference.

UK Defence First has set a minimum of 5 per cent of national income on defence and security, and has argued that Britain must supply its own forces. Neither is delivered by upper bounds. The remedy is dull and it is available. Publish the number, not the range. Fund the weapon with the hull, or do not announce the weapon. Stop counting foreign ships in British totals. Treat “fitted for but not with” as what it is: a ship that has not been finished. Until the department can say twelve, or eight, or six - and mean the figure without a qualifying phrase - the next announcement will read like the last one. Up to a fleet. Fitted for a war. Not with the means to fight it.