A2 is a EU law not UK, it's standardised EU as we can swap licenses easily under the free movement agreement. 250 nakeds and "sport bikes" being made now aren't sold as they previously fitted the previous 33bhp limit imposed in the UK so they have no real place in the EU as such anymore. 250's meet Asian license requirements hence these companies up-ing the capacity or sleeving them down to meet market demands.

The easiest way to bypass the EU A1/A2 rules was just do the test earlier before the new rules came in I did mine in 2011 and was "restricted" to 33bhp