OK, a few things here:
- It's within the limitation period
- The payout from the MIB was probably reasonable and within the guidelines for whichever PI was sustained. It won't be easy to dispute any of this.
- They're on the hook, they won't be getting any legal aid for this.
- A solicitor is not going to get you an awful lot further forward at this stage, even someone junior at a small firm is probably going to run up a £1k bill without really doing anything. It will also give the impression you've got a bit of cash which is not good.
- Get in contact with the MIB, plead poverty and try to cut a deal with them to get some kind of reduction.
If and only if you can't negotiate any kind of reduction then it may be worth getting some legal advice, however any reduction of a couple of grand will be partially offset by what the solicitors will charge you.