unbundling the local exchanges was/is good for competition and i'm all for that! the problem lies between the house and the exchange, as only BT have the 'right' to work on those cables and equipment... how can that lead to fair and open competition,? the result is they (openreach - how is it open lol) can charge £130 + VAT to come and change a microfilter, good business if you can get it, but hardly the result of true competition.
AFAIK you don't need to have to use BT to do the work in your house.