I've ordered the new router.  Joe tells us that the 40m router is a Linksys BEFSX41  , however this model doesn't seem to be available anywhere (unless you count secondhand ones on amazon....) even on the linksys website.  Instead I have ordered the next one up in the range which appears from the specs to be the same router but with 8ports.  It is a BEFSR41.  Should be with us in approx 2-3days as it was in stock.