I bought one the same as this on eBay
http://cgi.ebay.co.uk/Voltage-transform ... 53df281b2e and am wondering if it's too cheap?
When I searched for one the first time, I wasn't sure what the wattage should be, there were a number of choices and even a calculation so that you'd get it right (if you knew what you were doing).
As is my want, when I got the info from Ray, I checked out eBay and bought one similar to the one listed above, but I guess like everything else, you get what you pay for so I'll wait and see how it performs knowing that I can get a better quality one at Maplins.