Mastodawn

'This week, Film is Fabulous announced that it had recovered two previously missing episodes of the Doctor Who story The Daleks' Master Plan ... which will both be made available on BBC iPlayer in April.'

https://www.radiotimes.com/tv/sci-fi/doctor-who-archive-expert-sue-malden-exclusive-interview/

Doctor Who archive expert "optimistic" more missing episodes will be found

Doctor Who archive Sue Malden has detailed what led to the recovery of two Doctor Who episodes - and why she's optimistic more will be found.

Radio Times