DLM was reset yesterday, speed improved slightly.
BTO telephoned a central office to get the DLM reset, I wasn't aware this was a remote procedure. I thought an engineer had to physically do this at the exchange.
I was advised to allow a few days for the speed to return. I know this was only done yesterday but no noticeable change as yet.
When my Fibre was first activated, the router would resync during the early hours adjusting the sync rate until the nm reached the set limit. This didn't seem to happen last night.
Anyway, thanks for all your help guys/gals.
I am a self-made man and worship my creator.