What lense adapter do i need to put olympus pen lenses onto nikon 1?

I want to put olympus lenses on my nikon 1 where can i buy an adapter in the UK and what are they called

You are beginning to find out why it is so important to do a lot of independent research before buying a camera system.

If you choose the Nikon 1 Series camera, then you need to buy Nikkor lenses. There's an adapter that allows you to use Nikkor AF-S lenses used on Nikon dSLR cameras, but when you attempt to use lens brands other than the ones made by the camera maker, you are asking for a lot of issues that will slow down your photographic productivity

The only lens adapter that I'm familiar with for the Nikon 1 is the FT-1, also made by Nikon. It only works with Nikon lenses.

Like an entry-level Nikon DSLR, you need an AF-S lens to autofocus, but AF lenses can manually focus.

If you mean modern Olympus Micro-4/3 lenses, it is physically impossible to fit an adapter between the lens and your nikon 1 body, as the nikon's flange focal distance is only ~2mm shorter (not enough space for an adapter to maintain infinity focus)

If you want to mount vintage lenses from the half-frame Pen F series, there are plenty of cheap adapters, which will maintain infinity focus. Here are two such adapters:
http://www.amazon.com/...B006RCKYFQ
http://fotodioxpro.com/index.php/lens-mount-adapters/fotodiox-lens-mount-adapter-olympus-pen-f-lens-to-nikon-1-series-camera-adapter-fit-nikon-v1-j1-mirrorless-cameras.html

With any lenses adapted to different mounts, it is important to note that the lenses will have no autofocus or auto-aperture, so you will have to set the aperture on the lens and meter at the selected aperture

Forget about it. Lens won't talk to the camera, meaning that it's essentially like putting a brick in front of the camera.