I believe Intercockpit uses BGS? Then that would be with the LBA.
And depending where in Germany you live, Bratislava may not be too far? they use Oxford books.
not sure if training in Germany is acceptable nowadays with only the test done in that other country, but please bear in mind that a rating from any JAA country can be added to any JAA licence, so the UK CAA will add a fully German IR or ME rating to a UK licence, no questions asked.
cheers IP