Thanks for the suggestion, the TP Link looks like it'll do the job, just a shame it's not an all in one unit like the powerline wifi adapters I've seen.
A suggestion has been made for an all in one unit that you desire. However with wall sockets usually a foot off the floor, the range of the wireless signal may be impaired when mounted so low. I seem to remember that wireless routers work optimally if mounted 6ft+ above the floor.
I didn't see MrSaffron's post about the Teknet unit until after I'd posted my reply.
Thanks for pointing out about the positioning and wireless range, that's good advice and steers me toward the TP-Link nano router.
If I did get the Teknet device, it'd be situated in one of the bedrooms to provide a signal for all rooms upstairs, and when I extend the wired network into the loft, it'd be moved there to improve the signal spread upstairs.
EDIT: actually I've just had a thought - my Billion 7800N router is situated on the bottom shelf of a telephone table so that it sits beneath a DECT phone. Would that could interference of the Wifi signal and if so would it be enough to reduce signal strength upstairs to 1/2 bars out of 5?
Your plan was to use your existing CAT5 cabling around your home to provide a remote wireless access point. Of course any cable wireless router will do that task but you were looking for a small neat device similar to a Ethernet over Power unit. Throw into the mix the desirability of having wireless access points mounted reasonable high off the floor, then the TP-Link device must be worth a punt for a modest £18.
There may be visual issues getting power and Ethernet [from the router] cables to a high mounted TP-Link device but a it would give the fastest speed to the laptop. To me it is the best technical solution.
Is not the Tecket Device a range extender with the option for connecting hard wired devices? In other words accepts a wireless signal from your router and then rebroadcasts the signal to a laptop? If so, you could be disappointed with the speed presented to the laptop despite having a good signal strength.