Pleased to assist.
Assume E is at N50 (as given) on prime meridian.
E to F 300 so F is N55 E/W000
F to G 300/cos55/60 = CH long of 8:43 so G N55 E008 43
South to H will bring you to N50 E008 43
I think RL bearing is 270 (but I am a little tired).
8:43 = 523 min * cos 50 = 336 nm.
You must get into drawing diagrams.
Very common type of question and is all about departure and ch long varying with cosine of latitude due to spherical earth.
Members of the flat earth society think you end you back at the start!