Not sure if this is the right place to post this, but I have just found a website to help decide what double buggy to buy. It has detailed info on particular twin triple and tandem pushchairs on the market at the moment. It can be found at

http://www.twinpushchairs.org.uk/category/twin-pushchair/

Hope this helps someone :)

Thanks for that, im looking at getting a double buggy, still no clearer after reading it though as cant afford much so it depends on whats going on ebay : }