I know this was asked along time ago but I would highly recommend Harrison Beaumont. They offer both personal accident and skydiving equipment insurance.
www.hbinsurance.co.uk
I jumped in heavy winds once ... never again. Extremely scary and really damaged my gear. I now don't jump without skydiving insurance
https://www.hbinsurance.co.uk/activity-equipment.php?product_type=Skydiving