On advanced tariff, which means you can use your contract mins/text/data abroad in 40 odd countries for no extra cost. The data abroad is hamstrung to Facebook/Twitter/email etc. You can't stream video or audio but everything else works great ( I have used in mainland Spain and the canaries without issue).
I just spent 40m on the phone with three retentions to cancel my existing deal and they can't touch this deal.....cheapest they offered was 38 per month.
I don't know how good affordable mobiles are but the ordering process was easy. Hopefully all goes well.
There is a deal in the pic for their essential tariff for slightly cheaper as well.
FYI Deal was found via uSwitch.