Peugeot Expert van 2001 power steering leak

Depends on whether it is a connection like a brake pipe or what is common now just a pipe that pushes in with an o ring around it and a clamp to hold the pipe from falling out, in which case get a new o rin and then undo the clamp, pull the pipe out and replace the o ring

If it is a flare nut fitting then it may just need a nip up.

the other possibility is a cracked pipe

so just get in there and have a look, best of luck BTW

Thanks for the advice - soon as the weather clears up a bit I'll take a look.