The runners on my sliding wardrobes are shot. Who do I need to contact to get them repaired?

Hello, They may only need adjustment... A carpenter (joiner up nawth), or handyman may be able to adjust/repair them for you. Hope this helps

If they are really shot as you say, then it is best to replace. I use a website called www.doorstuff.co.uk. Yhey are very reasonably priced. Carpenter or handy man will be able to do it.