Technically speaking, there is nothing to stop you from wiring in some normal GTX receptacles and FI-28 male plugs to a UK 220V circuit. It should handle it just fine (it’s just a metal conductor), as long as you stay within the equivalent amperage (at 220V, you wouldn’t want more than a 10 amp circuit). Where you would get into trouble is that you would probably be doing this against local UK wiring codes. I don’t know the UK standards, but this could affect things like insurance claims if somehow this outlet caused a fire. Even though you know it’s a 220V circuit, there’s always the risk of some idiot plugging in a standard 125V device and causing that device to fry itself and possibly cause a fire or more.
Even the US has strict codes on what kind of outlets are placed. You can refer to this chart to see.
http://www.digikey.com/en/pdf/q/qualtek/nema-chart-non-locking-plugs-receptacles
When looking at normal 15 amp circuits, you can choose a 5-15 outlet or a 5-20 outlet. The 5-20 outlet has a special blade insert which allows both 5-15 and 5-20 plugs to be used. However, that 5-20 plug cannot be inserted into a 5-15 outlet (this is mainly a safety measure from the wiring code to prevent over-extending a particular 15 amp circuit and causing electrical fires/problems).
There is also a special 220V outlet in the US called 6-20. You need a special industrial plug for this and it’s really not used for electronics unless you want to use something like a brass Hubbel 220V plug. Again, the reason for this special blade configuration is to prevent someone from plugging in a normal 125V device.
As far as the outlets, if you want to do the wiring yourself and understand that it’s a 220V circuit, feel free to use a GTX on this. Just make sure your electronic equipment is setup to accept 220 volts. Once again, I don’t know your local UK codes and what is acceptable and what’s not. This would violate any wiring codes in the US for sure.
http://www.vhaudio.com/acreceptacles.html
VH Audio here in the USA also sells UK and Schuko outlets and plugs, if your interested. I’m sure there’s a UK source for Furutech plugs.