On Saturday, 16 May 2020 10:43:39 UTC+1, Bazza wrote:
We had a spike yesterday when a submersible pump tripped the main circuit (RCD) in the consumer unit.

Every thing came back up OK when reset ( including the LL phone) except the internet connection.
I have tried the following:-

1. Swapped out the ADSL router with a spare.
2. Swapped out the cable from BT wall socket to router with a spare
3. Swapped out the face plate (with integral filter) to the BT socket with a spare.
4. Tested set up with two different PC's and 2 laptops.

Any suggestions?

Spent a lot of time on it and it looks like the spike affected the 24 port switch so that anything going in and coming out of the switch was garbled. I have a new one coming tomorrow so keeping fingers crossed.
Thanks for all your help.