Basically we are doing this. For £23.88 for the year, you can claim blocked drains and they will unblock/plumb etc. For the first 14 days you aren't covered to stop people claiming straight away, but then you have 11.5 months of cover and think about it, it costs £50 just to get a plumber out and then £100's to unblock drains etc. but this is £23.88 and you can claim after 14 days and get your drains unblocked.
Save £100's - Yorkshire Water Plumbing and Drainage Cover HomeServe - £23.88 For a Year