Entry information can be found on the race website http://www.anniversarywaltz.co.uk/?page_id=137 where it's made quite clear that it isn't registered or insured through the FRA.
Note added later - I have been informed that the relevant page on the website has been removed for updating. The entry information was from 2013 although it did include a statement for 2014 about not being registered or insured through the FRA.