Irish Sea escorts faced submarines and aircraft

Were British motor torpedo boats deployed in the Irish Sea so larger escorts could serve farther out?

There may have been a few, but the dominant Irish Sea requirements were anti-submarine and anti-aircraft escort, for which armed trawlers were often adequate.

Some motor torpedo boats may have served in the Irish Sea, but they were not the core of its escort system. Submarines and aircraft posed the more important threats there. Armed trawlers could carry the anti-submarine and anti-aircraft equipment needed for those duties without duplicating a Channel strike craft. The local threat mix determined the force structure.