Mikechef370z

I have a 5 year old 370z convertible, roof stopped opening, took it to Nissan to be told it needs a new hydraulic kit (£6000) with 10 hours labour @ £120 per hour. option b....have the hydraulic part removed and repaired (£300 for the repair) with 10 hours labour @ £120 per hour. Nissan offering zero good will to me for a car with 19k on the clock. does anyone have any ideas of where to take this? can i get the repair done cheaper elswhere? thanks in advance Mike