Without seeing your medical records and the full extent of your injuries, it is virtually impossible to give a valuation as no 2 claims are ever the same.
The severity of the injuries, ongoing losses, long term prognosis, whether there is likely to be any contributory negligence all have a bearing on the valuation.
There are 2 elements of the claim, General Damages which covers the actual injuries you sustained and then Special Damages which covers all your other losses such as loss of earnings, out of pocket expenses and the like.
Put the two together and this gives you the amount you are likely to receive.
If you have instructed solicitors either under a no win no fee agreement or through your legal expenses insurance, then your solicitor is thre person best qualified to give you an answer and to be honest should have done so by now.
If you have not yet instructed solicitors, bear in mind that you have a statute of limitation of 3 years from the date of injury or date of knowledge whichever is the sooner, and so you need to instruct someone as soon as possible. They wil then be able to give you am estimate of the value once they have received your medical records.