Help!

My T25 won’t start! The battery is brand new, it has been charged up again, and the van starts just after the charge has been done then won’t start again. It is a little frustrating as I can go places but can’t get home! I’m a total newby but I am guessing it ain’t the battery. :think Any ideas? Is there a recommended garage I could take Ally Bally to? Or can someone give me an idea what to look for. As I say total novice but quite happy to get my hands dirty and learn. Cheers.

It’s possibly a power drain Jane. Alternator was ok when battery fitted. Will pop in one night and have a look during the week