UK radio amateurs have the opportunity to apply for a special callsign to mark the occasion of the forthcoming royal wedding.
It's all quite simple. G4VXE would become GR4VXE, GW5NF would become GR5NF, MM3JFM would become MR3JFM and so on. In order to do this, you need to apply, through the RSGB to OFCOM for a Notice of Variation (NoV). The only information you need to provide is your callsign and a contact e-mail address.
The special callsigns can be used between 29th April and 9th May 2011.
You can read about how to apply and the conditions of the variation here
I've applied, so it will be a bit of fun to use GR4VXE for a few days. Who knows, I may even fire up the HF transceiver...