It wasn't an easy transition, Originally the likes of the DC-4 DC-6 and DC-3 moved over to the EASA licence, hence well known operators in the UK would have had to move over to a Part 145 approval and their Engineers to part 66 Licences.
About a year or so later Easa decided they would be better suited under the Original Section L licence, so it all reverted back. I could imagine a lot of companies in the UK would have ended up out of pocket over that one.
That also brings up the fact that what is printed on your licence is worthless, until my EASA Licence was renewed several years later it still carried the DC-4 DC-6 and DC-3 and other types that were no longer covered by it on my licence coverage page!