Thanks for all the responses.

Not convinced it's an Italian cypress. The examples on 'tinternet are much much narrower than this one.

Also, I feel as if the tree is getting a little too big. Ours is a fairly small garden and I'd ideally have a couple of feet taken off the top (btw, I didn't plant it - it came with the house!). Can these be pruned/trimmed? I don't think I'd try it myself, would probably pay someone who knows what they're doing.