Thank you Whopity and BackPacker.
Whopity, I was checking the reference from you and the document mentioned goes on to say:
"In circumstances agreed by both authorities, an applicant who has commenced training under the responsibility of one authority may be permitted to complete the requirements under the responsibility of the other authority" further specifying that it allows for theory, medical and flying to be part of this 'agreement'.
Perhaps, however owing to all the red tape, I might be better off completing a course at Bristol or OAT just for the knowledge and then applying and sitting through the course at some German school just for the sake of 'procedure'. It sounds like a waste of time, but as with my PPL I actually went through an English self-study course first.
BackPacker, would you know how to move the thread to Professional Studies forum? I'm very new to this site.