>>>Windows XP about to expire
No, it's not. So-called 'support' for it will cease soon but there are plenty of XP users (such as myself) who turned off 'Windows updates' several years ago anyway. It will still carry on working.
>>>Windows 8 bears no resemblance to what I am used to and that it really needs a touchscreen.
I'm no fan of Windows 8 but you can switch back to a 'classic' desktop. Windows 8.1 also has the Start button restored to it.
Having got that out of the way (and assuming that you're not seeking a PC that requires a lot of processing power, e.g. for high-end video editing or playing the latest games), I'd be looking for a basic Windows 7 machine myself. (My netbook runs Windows 7. It's not a big jump to go from XP to 7). Consider one of these
http://www.accomputerwarehouse.com/products/computing/windows-7-pcs
together with a monitor
http://www.accomputerwarehouse.com/products/computing/monitors
(I can thoroughly recommend that firm).
You can get a keyboard and optical mouse from any large supermarket. I'm using one of these right now
http://direct.asda.com/ASDA-Smart-Price---mouse/000567126,default,pd.html
and it's just as good as far more expensive models. (My keyboard cost me £2, brand new, from a charity shop!)