Hello. Just in case this is of interest/help for anyone.
I reported the fact that though we were paying for Vivid152 we were not getting speeds in excess of around 45Mbps. An engineer called and tested the router out (it was the one before the latest) and decided it was the problem, so he installed a new router (which apparently transmits/receives 360 degrees, unlike the previous one which was one-directional) and around twenty minutes later we were strapping ourselves in for speeds well over 100Mbps. In fact I've run some more tests today and got from 140Mbps to a somewhat dubious 180Mbps download.
Either way we are now supersonic-ish. So to be recommended.
And can I mention the excellent Trevor who fixed it all.
But I have to ask -why have we been paying for a long time (year or more?) for speeds up to 152Mbps when all we could actually ever get were up to around 45Mbps? A lot of money for not a great deal.