Mike mate you prob be looking at the other end of £150 mate if you go to a garage but I'd say tis worth it if you go to a very good garage or just have your own mechanic like me

was just looking on ebay there, timing belt kits are about £80, i rang my local motor factors a few months back and they told me the kit was £40

edit take a look at this mike its a kit for the 1.2 stilo. not a jtd but this guy supplys the kit and will fit it for £100
http://cgi.ebay.co.uk/Fiat-Stilo-1-2...item3eff032e28

To do this job correctly its not just a belt change..you need to change the belt and tensioner and probably the water pump at the same time..if you dont then you could well be in trouble in the future if the tensioner or water pump fail..they could cause the engine to self distruct if they do fail..water pumps on the JTD are well know as a weak item so really needs to be done at the same time Mike..