Small claims worked for me as well, but I would not bother with anything less than £500 because it takes quite a while to put all the paperwork together. And beware, if you are the claimant you will have to travel to the nearest Small Claims Court to the defendant. But you will be able to claim the travel costs back, if you win. I won and got expenses, but had to take a whole day out from work to travel the 150 milers for the ten minute hearing.
I would not have taken on this job in the first place, even though I used to work a lot with Novell. Just like I would not take the job I saw advertised two days ago. Project manager wanted for Windows 7 rollout. Seriously! Windows 7! in 2016!