Right then,
Plot thickens. So we complained and "nothing was wrong" BUT ....... Went round to the flat to check the new acoustic glass , which is amazing by the way!!
And the builders have been in , fitted a new switch on the cooker, fixed the dishwasher, repainted the hallway and moved the pipe and boxed it in. I think they may have been a little bit motivated as they were aware that we had threatened to talk to LABC ref the installation. Without telling us they went in and sorted everything as if there was never a problem !!
Changing something is quite often the biggest admission of guilt needed. I have a feeling the sparky was not to blame for any of it to be honest and was a victim of lazy builders.
all sorted now though so cheers for all of your advice , check out my renovation project as it evolves !