When's the best time to prune a conifer hedge?

[Bert]

That's it, really. I have a hedge of alternating conifers of two different types - I've no idea what they are, but they aren't leylandii, I'm pretty sure of that. I like to keep the hedge about 4 -5 ft high. It's looking a bit raggedy at the moment, so I'd like to tidy it up now, if it's a good time. But should I wait till autumn? Does it make no difference as they aren't deciduous?

[RATTER15]

It doesn't make a lot of difference when you do it, just remember to make sure you leave greenery on each branch or you will lose the said branch, it will just stay brown.

[honky-tonk]

We normally do ours in April and the last trim in September.