I was just wondering if it was possible to get a company like BT to wire my home at 100mbps, because it is unlikely they will do my street, and if soo, how much is this likely to cost, as a one-off and monthly I live fairly near the exchange centre.

Any Telco like C&W BT etc can provide you with connectivity - like they do for firms Government etc.. The BT products are LES WES or EES 100 .... and look at C&W MSP
Price install about £3k then what services do you need??? I would think about £20K pa ..... for internet.