Slip and Fall Injury Claim Advice Needed

I slipped on wet flooring at a supermarket about 4 months ago and fractured my wrist. I've been unable to work as a result and have ongoing physiotherapy costs. The store manager acknowledged there were no warning signs. I've got photos of the scene and my medical records. I've not made a claim before and need guidance on whether I have a viable case and what the next steps should be.