Richard, what you have to beware of the MIB is that many solicitors that deal with your claim via the MIB may deduct a percentage of your compensation to accomodate their costs, the MIB are notoriusly famous for offering low amounts for compensation and prolonged periods of claiming. they will also deduct the first 300 as a property damage excess.
My advice would be to pursue an injury claim via the MIB yourself www.mib.org.uk there is an online claim form. and the process is relatively easy.
Any more information feel free to reply