Really, that sounds like a pretty poor excuse for not being competitive.
Well, that's your interpretation. Typically, Poles are subcontracting to Poles. They are also pricing jobs at less than the minimum wage or at a price that our skilled people won't work for, and that's been alluded to by many commentators, i.e. driving wages down. Think Jeremy Corbyn has said staying in will drive wages up - some chance.
Apologies if you saw my original reply as rude - it was missing the smiley that would have shown I was joking. Bit touchy?