I'll respond to both posts above.
First, disclosure of documents. I disagree with Joker's suggestion that you shouldn't have disclosed your own documents until you received your opponent's. That is the usual way to do things in larger litigation but I'm far less concerned about it here. You have nothing to hide, your case seems strong and tactically it looks best if you are seen to be proactive and squeaky clean conduct-wise.
Continue to chase for his documents. Always write and keep a copy of your correspondence. Shortly before the hearing, if you still haven't received any docs, do another quick witness statement attaching copies of all that correspondence.
Tactically, it doesn't bother me at all that he hasn't given you any documents. If he produces them late - he looks shoddy. If he doesn't come up with anything at all then it demonstrates that his case is weak. His arguments will be hamstrung if he doesn't have documentary evidence to support, for example, allegations that you had damaged the property.
Witness statements giving character references aren't strictly admissible but given that its a small claims court case I'm not concerned either way.
Enforcement is the tricky part. I would be amazed if the defendant were able to vary any order made against him in order to pay by small instalments. This is a case of an individual's business - I just don't think he has good grounds to request payment by instalments.
If he doesn't pay immediately following judgment, then you will have to consider one of the options I mentioned previously.
Option 1: Apply for a garnishee order (I don't know what they're called in the UK anymore - possibly an attachment order). That is an order over a debt owed by a third party to the judgment debtor. The most common such third party is a bank. If you know the defendant's bank account details (which you might have from when you used to pay rent) then you may be able to get an order for the judgment amount over monies in his bank account.
Option 2: Serve the judgment debtor with a statutory demand. This is a formal request for payment, based on your judgment. If the debtor fails to comply within (I think) 21 days, you can commence bankruptcy proceedings. The threat of those proceedings is usually sufficient to make the individual pay up.
As for an order for costs: I simply don't recall the relevant provisions of the CPR in relation to small claims court matters. Its worth trawling through the rules and make a submission at the end of the hearing (supposing you win of course!).
If you have any more Qs then fire away. Alternatively, if you'd like me to cast my eye over anything you've prepared then drop me a line.
Chalks