Fell though open, unguarded trapdoor in public house: can I claim compensation?

I was in the pub on Friday night, went to the toilet and on returning unbeknownst to me the pub workers had opened a trap-door in the middle of the pub which had no one watching it or signs around it. I fell through the trapdoor 12 foot and was knocked unconscious. An ambulance was called and I was taken to hospital and kept in over night. Nothing was broken however I was badly bruised and knocked up. I was given crutches as I had difficulty walking. I'm expected to make a full recovery within the week. My question is that I broke my watch in the fall, had my clothes cut off me at the hospital, could not go to an event I paid for over the weekend and my partner who was away for the weekend had to get back to London at expense to look after me. Whilst I would feel guilty if any one lost their job over it (though I was told I was extremely lucky as I could have broke my neck), the pub was negligent and as well as physical injury it cost me money. I would therefore at the least like to recover the money I lost as a result of the accident. Any advice would be appreciated.