Battle of Britain 75th Anniversary - 16 July 2015
Royal Mail issued a miniature sheet of 6 stamps (3 x 1st class, 3 x £1.33) to mark this anniversary. They also used a slogan postmark but as usual this was not announced sufficiently early for collectors to obtain first day covers. Also, being a miniature sheet, the slogan would have been unreadable and may not have reached all 6 stamps.
This is a Royal Mail fdc with one single 1st class stamp from the MS with the Swindon '75th Anniversary Battle of Britain' slogan postmark.