Thank you for your help. I have now sorted my problem. The problem was with the network name, I thought they were all the same but it turned out they weren't. Changing them to the same allowed them...

Region : UnitedKingdom Model : TL-PA251KIT Hardware Version : Not Clear Firmware Version : ISP : Having had 2 x TL-PA251KIT devices for some time I decided to extend my home network and purchased...