Britain’s nine-month delay in publishing its Defence Investment Plan (DIP) has stifled parts of the UK’s military supply base, according to defence industry figures cited in a Reuters report.

The delay comes as Prime Minister Keir Starmer is expected to publish the DIP on Tuesday, one of his final acts before stepping down in July. The plan has been held up by disputes between the defence and finance departments over how to cover an estimated £28 billion shortfall tied to meeting a rising threat from Russia.

Defence companies say the absence of the DIP has removed the investment confidence normally needed for private firms to scale up. In the meantime, Reuters reports, contract awards from the Ministry of Defence have dried up and even smaller procurements have taken longer than usual. As a result, some firms have shifted focus to winning work overseas—meaning the UK risks losing jobs and investment.

An industry lobby group, ADS, told Reuters that dozens of smaller companies have either gone out of business or shut down their defence units and moved into other sectors.

Some companies say work that was expected to come through in the UK has not materialised. Others argue that without clarity on what the Ministry of Defence wants and when, start-ups and manufacturers struggle to commit to new programmes.

Reuters also reports that the one area of steadier demand during the delay has come from Britain’s involvement in supporting Ukraine, where UK-backed innovation in certain technology areas has kept moving. In that context, several projects have continued quickly, including work on next-generation navigation systems and prototypes for a low-cost advanced long-range strike weapon.

As the DIP approaches publication, the industry is focused on whether it can re-start contracting and investment at a faster pace—especially for domestic manufacturing capacity that has increasingly looked elsewhere while the UK plan remained missing.