|£40 doesn't offer much choice as most are the wrong side of £50. But I found this one manufactured by Biostar: http://www.m4store.co.uk/a780l3b.ht...|
No reviews on the vendor's site yet, but I'm sure you'll find plenty of reviews for this board if you google it. Don't buy without reading reviews first as I've no experience of Biostar boards myself so don't treat my post as a recommendation. I know you asked for one, but I can't recommend something I've had no experience of, I'm just trying to help you find something within your budget.
If it's recommendations you want, my guess is most people will recommend you spend rather more than £40.