I did this last year, £70 for upto £1k when you submit, the person you claim against gets it added to what they owe you....if your successful, not called small claims anymore but will come up if you Google that.....fill in on line, it's simple, you obviously need evidence, but only have to say what it is in 'drop downs' on submission form, and provide a timeliness the same way, and pay.....they get so long to reply.....it's easy to do, I got paid what owed plus the £70 quite quickly......they also email you when person reply to claim.
You can claim interest too.