I'm travelling to Cheltenham and i need to take my bike, but a don't no if i can take it on the train?

usually yes just check with station beforehand

Like shane said, check with the station - or ask when you buy a ticket.

Be aware that rail staff are often less than the happy smiling people they are depicted as on the posters; last time I took a bike on the train they were shockingly rude.

It shouldn't be a problem iv'e done it before and some trains have special bike racks where you can lock your bike to, any First train should have this bike rack.

You will have no problem on the train.

http://nailseacycles.co.uk

contact the station, it'll be more useful than asking a bunch of people sat at their computers with nothing better to do.

You should watch this video. It will answer all of your questions:

http://www.youtube.com/watch?v=EAN_BEn5aKk

Luck