The locomotive shown is No. 6009 "King Charles II". This picture is the cover from the remains of a Railway Wonders of the World magazine from July 1935.
GWR King class 6009 Cornish Riviera Express Dawlish framed picture free p&p UK
BR EX GWR - KING CLASS 4-6-0 NO. 6009 @ SOUTHALL - VINTAGE IMAGE - # L9889
Hornby R.349 GWR King Class Locomotive 6013 King Henry V111 OO Gauge Boxed
Hornby R3534 (OO) GWR King Class Locomotive No 6023 'KING EDWARD II'.
Hornby R3331 GWR King CLass 'King James I'