vctenderness (great choice of PPRuNe name by the way), there are several Spitfires flying around with D-Day stripes, which will show up as the three white stripes you saw. As mentioned by treadigraph, it may well have been one of the Heritage Hangar Spitfires (see here:
https://flyaspitfire.com/about) but I'm afraid that finding out which one will be difficult if not impossible. You could call that company but even then they may not know for sure.
I don't know if any Spits are fitted with ADS-B capable equipment, I suspect not many, and therefore sites such as Flightradar24 will not always show these aircraft.