I am indebted to Steve Barker, S&J News in Rochester, Kent, for pointing out that my advice in the 11 September issue on how to get a ‘free’ 0800 number with alarm company ADT did not include the fact that there is a £99 plus vat charge to convert to this.

As I observed to Steve, neither ADT nor the retailer who raised the point in the first place mentioned this to me, but I guess the clue was in ADT’s reference to an ‘upgrade’ to its 0800 freephone service.