Accident at Rail Station

I had a fall at my local station I tripped when a plastic newspaper tie wrapped snagged around my ankles and I fell on my face, knees and hands, whilst I was walking up the platform, the fact was that the staff failed to clean the station that day and it was littered with rubbish.   I have since had two ACL ops on each knee as I had a torn legiment in one and just a tidy in the other, there is DVD footage of the accident which they have seen and is with the legal team, apart from my knees I suffered brusing to my shoulder and hands, this is going through the legal process at the moment but I am not sure if Ihave the best support my claim has been assessed quite low and considering I have spent time in hospital 2 visits overnight and 12 + weeks of physio twice a week and have incurred expenses plus time off work (as leave) the value they put on it is Â?2,500 should I seek a second opinion as I have been told this should be higher.