Thanks for the info and advice guys. Should be my weekend job. I was having a look last night and there's not a lot of room at the front of the engine in the transverse installation in the Trevi. Doesn't look as easy as changing the belt on my Fiat 131.
Had a lot of fun trying to get the lights to work last night. Ended up being a bad connection in the fuse box so I took it off, took it apart and re-soldered the offending pin. Works fine now but it was 1:30 in the morning by the time I finished.
And just to make it all feel worthwhile I used the car to get to work today