A nice price this; and a good chance to visit both Lisbon as well as Boston. Flights are from Gatwick to Lisbon to Boston then back to London. They are with Tap Air, and include a 10kg Hand Luggage Allowance + an extra personal item.
Example Itinerary:
London to Lisbon 24th Jan
Lisbon to Boston 27th Jan
Boston to London 3rd Feb via Lisbon
Example Dates In Other Months:- 28th Feb > 2nd Mar > 9th Mar
- 5th Mar > 8th Mar > 16th Mar
- 11th April > 15th April > 22nd April
Hope it helps someone