Actually I've just found it and it finally worked! Enable pop forwarding in desktop version of yahoo. Rate changes. Then in android mail set up manually to pop.mail.yahoo.co.uk, use SSL, port 995. Then smtp.mail.yahoo.co.uk, use SSL, port 465, require authentication ticked. And voila!!! Lol...
When I enter www. yahoo.co.uk on my laptop it changes to uk.m.yahoo.com and runs the mobile version for the homepage and mail. I'm using the broadband wifi home network. I don't have any problems on any other site.