I was listening to the GUKPT live feed the other week and this was discussed. Any ticket won on Grosvenor can be used in any Grosvenor game. You can uses them as part of buy ins for bigger games. You can also use them during the festival for the other games and if they are a lesser value you keep the difference in credit. Also they don't expire so you can keep them for next year.
Brilliant thanks Kev