5 weeks off sounds like it was quite a bad injury.
A couple of points:
Did you make an entry in the Accidents book? This is important
1 Maybe your employer is careless and there is a pattern of accidents but they are not being properly reported
2 You will have difficulty making a claim later if not
The accidents book must be accessible to you, it must not be kept locked away and you do don have to ask anyone's permission to make an entry.
Do you have a union? They're not too common these days but can be very useful when you need them
Very important: Don't sign anything saying you waive future rights, except with the advice of a trusted and independent solicitor.
More worrying than a bit of time off work is the possibility that your injury may lead to long term problems or get worse as you get older (I hope not). Take advice on whether you should write a letter to your employer saying you reserve the right to make a claim if that happens. Make sure your doctor or hospital examines your injury and records it.
If your employer is giving you full pay while off this is no more than he should be doing. It is not unknown for employers to sack injured staff to avoid giving them sick pay
If you had lost a leg through your employer's negligence then you would be entitled to compensation and no-one should criticise you for seeking it (even Breezer above
) but none of us here is in a position to say how badly you were hurt and if the employer was at fault.
I have heard that these Claims companies who advertise on TV charge more and are less professional than your friendly local solicitor; but your union or CAB will be better able to advise.
If you "string it out" or pretend to be laid up when you are actually down the pub or playing 5-a-side, then you deserve to be, and probably will be, found out and come away with less than nothing.