Avro 701 Athena T.Mk.1
As noted in the FD thread the Athena was designed to Spec T.7/45 to fulfill the need for a turboprop-powered advanced trainer. Only two AS Mamba I powered and one RR Dart powered Athena ever took flight with a turboprop. The whole programme was cancelled in favour of the Merlin-powered Boulton Paul Balliol.
Here is a what-if Mamba-powered T.Mk.1 in standard RAF training markings.