Remember everyone who is quarantining and testing is included in the figures as a found case, there would have been British Citizens returning home from India and quarantining, given the situation in India it is not at all surprising that many of them had Covid, and not surprising that they found them.
East Midlands and London are the most likely home addresses I imagine in the geography of my head, so it's that seems sensible for the locations.
I'd say this is another time when dashboards are unhelpful, the context of those cases is essential to understanding, picking such small changes of numbers don't give a true picture.