Sorry if i sounded rude, i completely missunderstood you,
From my point of view if you trained in the UK it's ok to do it in Spain and save some money, as you are already familiar with flying in UK it wont be a problem adapting.
If you trained abroad then it may be a good idea to do it in UK.
In my case i did all my trainig in Sapin, but it was an english course in Airmed, did my FIC in Aerofan, and then landed a job as FI in UK, i needed some familiarization of the area but that was bsaically all.
Good luck and sorry again