The minimum amount of an award is �1000. If the injuries which are sustained aren't serious enough to trigger such an award (e.g. if you just received scratches and bruises), no award can be made.
The maximum award is �500,000.
There's a guide to the scheme here. (For some strange reason, it's on a secure server, with an 'https' address. That means that AB won't 'hotlink' to it. You'll have to copy the address and paste it into your browser bar):
https://www.cica.gov.uk/pls/portal/docs/PAGE/INFORMATION_PAGES/INFO_BOX_BOTTOM_ABOUTCICA/TS2%2520GUIDE%2520TO%2520SCHEME%2520(APRIL%252004)_0.PDF
There's a tariff calculator here. (It's also on a secure server. So it's 'copy & paste' again). You tell it about the nature of your injuries and it works out the relevant amount:
https://www.cica.gov.uk/portal/page?_pageid=115,90972&_dad=portal&_schema=PORTAL
Chris