Hi Sean,
For the duration you are unable to work, you will recieve full loss of earnings untill the point that you are able to take some form of paid work,
If you are not able to return to a job that paid as well as your last job then you will recieve the difference between what you were earning and what you are able to earn... (if anything).
This will be calculated on somthing called the Ogden tables, which takes into account your age untill retirement, also if you had potential to earn more, say expand you business and you can put a good arguement in, then you can also claim more than you were earning, this is due to your injuries limiting your capacity to otherwise earn more.
Hope this helps somewhat.
Stacy