Sherry Coutu is among the signatories warning of a skills shortage

Technology entrepreneurs, investors and advisers have called for an urgent review of visa rules, warning that restrictions on skilled workers are creating a “skills crisis”.

With a cap on the number of visas issued for skilled non-European workers being reached for an unprecedented fourth month in a row in March, a group representing the technology industry has warned the government that the rules are “no longer fit for purpose”.

Tier 2 visas for skilled workers from outside the European Economic Area and Switzerland are issued by the Home Office on a points-based system, which measures qualifications. Higher-paid workers receive priority once employers have shown that they cannot hire the staff they need within the UK.

The cap is broken into fixed monthly allocations. Until December,