Question Author
I really do appreciate the help that everyone has given to me on this matter but I fail to appreciate that my internal wiring is at fault. However, I shall keep a check on matters for another few weeks because BT still has it listed as an 'Open Fault' which was due for completion last Wednesday.
Interestingly, it was originally listed on the 10th March for competion by the 17th March. Remained open until re-listed on the 14th April for completion on the 18th April. Then again re-listed on the 20th April for completion by the 22nd April. It will be interesting to see what position prevails when it is removed from the listing, as having resolved.
Hans.