Not the hairy kind but the steel ones found in lower suspension arms.

I'm looking at changing the lower ball joint on my s-Type to get it back through the MOT but I've read on the not so helpful jag forum and they need pressing out and new ones pressing back in.  Does anyone know anywhere in the midlands I could take the arms to that would be willing to do the change?  I'm thinking more along the lines of engineering firm rather than garages...