Just had a look - the offending aircraft was an easyJet Airbus A320; EZY2368; origin - Lisbon.
According to the playback at Breachwood Green it began to climb from 874ft (about 300 above) and was up to 1,655ft/142 knots at the airport boundary (about 1,100 above), but continued on the same heading.
Must've been a late go around. Looks like an aircraft was departing when the aircraft was flying over Breachwood Green. The aircraft gained height and speed; over Asda it was travelling at 2,485ft/183 knots.