Westwood T1200 won't start - I suspect it won't go into neutral?

It stalled (as usual when grass is very long). Just clicking when trying to start. Battery seems good (it started 10 mins earlier and lights on 'dashboard' working). Pull start feels like something is engaged ie can't pull the thing (I pull started it earlier in the day as first time after winter rest).
I've seen comments about solenoid - any ideas as how to tell what is problem??? All contributions gratefully received!!