Excuse me if I missed something, but how can the UK ruling be relevant? Unless my schooling was really far off, no part of the Alps is in UK airspace. Surely one has to comply with Somalian ruling while in Somalian airspace, with Kyrgistan ruling in Kyrgistan airspace, and so on?
That said, I feel quite certain you'll not have to deal with the, ahem, unique, quadrantal or was it semi-quadrantal altitude ruling. In decent places (which in this case even includes continental Europe), eastbound courses (or was it headings?) go on odd flight levels, westbound on evens. Allow for a few exceptions, though.