Hi Nick,
I am a chartered surveyor (MRICS) so can answer this question for you, To be honest none of these options are going to meet your needs, they are whole new professions that would cover material far wider than building regulations. if your just weak in the area of building regulations have a look for a short course. The RICS offer some, but the best place to look I see CABE (Chartered Association of Building Engineers) they have mainly building control members so may offer a short course specifically in building regulations.
Thanks
T.