We land at Gatwick before traveling through Wales, Spain and England this summer. I'm taking an iPad mini and plan to buy a chip - (edit that; sim card) . Any recommendations on whether to buy at the Gatwick airport or wait until Cardiff and go to a phone store? I've had both good and bad experiences both ways.
Also, does anyone know if sim cards now work across GB and Spain? I'd read within the last year that countries were beginning to work together and share. That would be nice!