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There definitely is a problem in Dover. I had an engineer out to replace my blown up v6 box, and when I told him my speeds have gone from consistent 200mb, to now averaging 30mb over the last 6 few months, he told me there are big problems in the Dover area and about 30mb is average at the moment! He did say it was being worked on but had no timescale.
I test mine daily and at different times, have cat6 Ethernet cable direct from the hub which is 2 metres from me so no use robbing us off saying it's our fault with cables etc when I have always had over 200mb up to 232mb on the router and now get between 30-40mb at a push!