In reply to MeMeMe:
If you're only selling, use whoever you can get a good recommendation for, regardless of location.
Local means it's easier to fill in forms and they won't get lost in the post (like what happened to us last year with one document, despite being sent recorded), but that's about it.
Use a small company, though. Be aware that some companies these days are just a front for big off-shore conveyancing companies - can get away with it, as so much can be done online now. Actually worked in my favour when I sold my last house, as my buyer's team didn't ask any awkward questions about my then neighbour.