Hayter Harrier 41 petrol mower for spares or repair (Stonehouse GL10)

Petrol mower, Hayter Harrier 41; we can't start it - anyone else like to take it on and repair it, or like to use it for the parts? It's about 15 years old, with owner's manual, new air filter (not yet fitted), new spark plug (fitted), and bottle of oil. All ready for anyone who'd like to fix it. Was running OK up until last Summer. Rotary blade type, but has a roller on the back so you can achieve stripes. Soft grass collection bag. Pull- start ignition.