Whilst this seems a bit pointless as the only reason to use router mode is for wi-fi, which is not what the issue is, I have however have done what you have asked. (all this now does is broadcast the Virgin wi-fi SID and use a slightly different Public IP).
The issue is somewhere between the Hub and the V1 exchange the signal is continually dropping out.
Ok the Technician has just left, The upshot is that we have old cabling from the road to our property, which is a not capable of handling the signal currently servicing Camberley, He has added an additional booster to the line in the house to hopefully keep us going for now, and we have more engineers coming out to run new thicker cable to the house from the street. will keep updating this in the meantime, but we are now waiting for the 6th of August.