OP
Octopus
If you read again - what I have said is that I am PLANNING a new layout and this swap of the cooker is in ANTICIPATION of that. The very small simple job that I have done is the ONLY work that has been done in the kitchen since the rewiring 4 years ago. One small change made - one new problem manifests. It doesn't need Dr. House to conclude that there is a connection between the two and take that as the starting point for a diagnosis.
"Thanks for your help and suggestions" would have been ok but to criticise my imput is somewhat unhelpful and ungrateful. As YOU say, its alsmost certainly something you may have done, so if you turn to outside help, maybe you can save yourself money and the sparky time, if you point out precisely where you made changes.