Cat111 - thank you for the suggestion. With my experiences with wifi, almost anything is possible. My location is NE Norfolk and I don't know whether there are any possible EMI sources locally. However we are very close to the main UK gas terminal and there are more plods to the square inch here than anywhere I have previously lived. On e could assume a lot of plod radio traffic and DAB reception is crap - but then that seems to be universal!
As I wrote in my previous, I think I shall leave well alone for the moment but on past experience, I can foresee a return engagement in the near future
