Thanks for the response. Having now done my homework and received the some responses from various centres, it would seem that the only real prospect of a part time option in Spain is in Madrid. The new online CELTA, however, would seem to offer a good deal of flexibility equal or exceeding that of the part time course.
To answer your questions; I can support myself and indeed my family for 3 months in Spain and my time would be spent enjoying life instead of wasting my time working!
All things considered I will probably go for the course in Seville as a full time student and just try to prepare really well.