[OXO cube]

Positive wired track is the gold standard.....I would stay with that and look at changing the DS controller innards.

Wouldn't the Pendle track be wired to BSCRA standards?

which ever way round my home track is wired , its opposite to the way Pendle club track was wired , hence the reason why my DS controller wont work on my home track , but would on the Pendle club track 
i will rewire my home track to the way highlighted by Andy and will report back 
might be a week or 2 though

changing the innards of the DS would be the last resort , it would most likely end up in the parts bin , in seperate parts , knowing me and my electrical expertise