FunkyCable,
I would suggest either borrowing a router from someone and testing or if you're feeling a little ca$h rich go out and get a new one.
How old is the router? The latest firmware is 28/10/05 (version #197e7b)
---------- Post added at 14:20 ---------- Previous post was at 13:56 ----------
The only thing I can find on the FAQ from Safecom that relates to SWBR-5400 and telewest (10Meg) is:
http://adsltech.com/portal/forum/for...?TID=6597&PN=6
Speeds fine through wired and slow on wireless (1.5Mpbs, All be it through wireless B connection). The safecom admin repling says it's a problem with wireless B talking to G. From reading the specifications the router is backwards compatible

. OK you're never going to get 11Mbps which is the max. for wireless B standard, but I would have thought it would have been higher than 1-1.5Mbps.

This might sound daft but:
On 10Meg connection the router speed is fine wired, but to Wireless B max. 11Mbps and only getting 1.5Mbps (aprrox. 13.64%)
On 20Meg connection the router speed is fine wired,but to Wireless G max. 54Mbps and only getting 7Mbps ( approx. 12.96%)
It does sound daft, but the two percentage figures are too close to be daft.