the one i has just has boost retard, it has been completly modified, there is a mechanical advance set up with weighting, but when boost comes on it retards the timming, no vacuum advance at all, i had it done by a proper dizzy mob and it cost somewhere between 200-300 including rebuilding the dizzy,

i also have a factory electronic dizzy from a US model which allows you to hook up boost retard, i got it after i had my dizzy done, but it looks preety shaggy, would be best to rebuild, best thing is most of its part numbers match those of the non electrical dizzy sold here, like cap and rotor button etc, i'd be prepared to part with it