The Anson looks like N9742, which would indeed be an Anson serial. The markings are not French, but RAF. French aircraft have marks on the rudder, not fin, and in the opposite order. It was used a a general reconnaissance and coastal command aircraft, and also largely as a trainer. Nearly 7000 of this Mk I variant were built and some 11,000 Ansons in all from 1935 to 1952.
PS: there is a photo of N9742 at:
Avro Anson Mk I N9742 - Warbird Photo Album
Also the history of N9742 on the Skyfame site (scroll down quite a bit):
Tribute to Skyfame
It was indeed "MW-Y", 217 Sqd, flown by Dutch crew.
There are a lot of references if you Google Anson N9742!
Laurence
PS: MX corrected to MW, on JW411's advice!