Brief OT again - guys have been around and dug out drive. They knew about tracing line but said, and I quote :
"Its a BT line so it'll have a proper conduit, if it was cable then we'd have to hand-dig as morons install that".
True to their word, after two hours of "extreme gardening" with a digger
the initial "scrape" was done. BT cable conduit exposed all the way (appears to be only 200mm below the pavement level) just using a digger. Total "damage" to my connection = 4 CRC errors.
Just thought I'd put that in here as although it was the builders who put that conduit in, its nice to see that I'm not the only one who thinks NTL are total cowboys