[MovedGoalPosts]

I'd suggest you don't use email - there is no way you can prove anyone gets it. Once things have a threat of going legal, go back to snail mail, and ddo it by recorded delivery so you have proof of delivery.

In this case, it may be worth a phone call to ntl's customer services, but I'd suspect that would end up in telephone ping pong. I'd simply do a recorded delivery letter to both ntl and the people now threatening legal action, stating that you have the kit which they are demanding back, but as ntl are very aware it has been reinstalled at your new address by ntl.

Of course it looks like a lot of the confusion is in fact caused by your kit having been relocated and databases not being updated. It woud be worth raising that issue in your letter to ntl that they need to ensure that the right hand knows what the left hand is up to.