I have had several copies (and seen a fair few over the years) of the Groove disc in question, but always had it down as being too fast to dance inna 'side-to-side NS stylee' to it, so couldn't justify a three-figure price tag.
However, I've only ever had one copy, and not seen others, of their disc on Groovey, 'I Do' / 'M.T.Y.L.T.T' , of which the flip is a fantastic uptempo Northern dance track. It was also recorded by the Swingin' Medallions, but as good as they are it is lightweight compared to KE & BD's.