If you want to e-mail Tristan use the CONTACT ME form and I'll forward the e-mail on to him direct - I can't guarantee a reply, but I can guarantee that he'll read your message.
You can Tweet him via his ID of @TristanGemmill - again, no replies guaranteed.
You can write to him via his Agent - please include a SAE if you want a signed photograph or reply - which is not guaranteed.
c/o Independent Talent Group Ltd
40 Whitfield Street
c/o Coronation Street
Trafford Wharf Road