Force Automatic remap for epg

Hi I have somehow managed to get the epg working iwth webgrabplus however it is painfully slow. I have acquired a premade one from another source who updates it.

Problem I have is that the automatic remapping of epg sources. I cannot get it to pick it up. How can i force it to remap. All the names are the same, only difference is it has the suffix ".uk" in it eg. "Channel XYZ.uk"

Any ideas how i go about doing this other than mapping every single channel indidivually.