Hi guys, thanks very much for the replies.
OK, well I discovered it wasn't the location !
I spoke to my flatmate again and he then said that he'd been having the same issues.
I then re-evaluated my equipment. My phone was getting the same dropouts.
(I thought it was only losing some signal strength not the entire signal itself.
However it turns out I was losing full signal strength and getting complete dropouts too).
So I narrowed it down to the router itself.
We also had a total loss of internet for 3 days. The virgin engineers came out and fixed it.
After they did that and we setup the new superhub (with a working Wi-Fi chip this time !!)
things have gone back to normal.
It was the old linksys router (served me faithfully for 5yrs bless her !).
So, once again thanks to everyone for all the help, it's much appreciated