Well well, Houston we finally have lift off!!
Finally sorted itself late this afternoon. Very helpful BT techie changed some settings on my HH 3 remotely for me and asked me to get Vodafone to resync SS3 - and hey presto after and hour and a half it came back to life.
He said he followed advice from an earlier Vodafone blog a couple of years ago which I have copied below for the more enlightened of you.
Incidentally vodafone told me when I asked for a re-sync that the problem was now solved and that what BT had done was the best solution?? Not confident this would have got sorted otherwise. BT 1 Vodafone 0 !!
•First step is to identify your Sure Signal on your network, this can be done by matching the MAC address on the back of the unit to one of the MAC address' listed in your network (I renamed it sure signal for future reference)
•I then set up the game/application rule under port forwarding and followed the steps to open ports 8, 50, 123, 500, 4500 and 1723. I set them to 'any' where I had the choice of UDP/TCP.
•I then applied this game/application rule to the sure signal
•I also turned on 'port clamping' which can be found under broadband settings, then VPN.
•I also switched on DMZ under port forwarding (although I do not know if this is 100% necessary, it was a case of try everything )
•I then called Vodafone customer services and asked them to re-sync the device, which they said would take between 5 mins to an hour.
•Sometime later I checked back and all the correct lights were illuminated and not flashing.
I hope this helps others a bit, for reference I think I have a homehub3 and that's with BT infinity.
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