Times Jumbo Cryptic 736

[mightymouse]

Stuck on a few!

13a Toff's turned on by gripping book N?B?Y
19d Girl's hugging dwarf tree G?L???N
39a Volunteers to go round with pygmy T?A
35a Leader of Tories getting upset about what could be trouble S?T?O?
Many thanks!

[ace bt]

nobby
gallows
twa

[Lie-in King]

13a Nobby ('on' turned + 'b-b-y')
19d Gal-low-s
39a T-w-a (w=with) (Twa pygmies)
35a Sh-t-ook

[mightymouse]

Many thanks!

One final question, I have GRASS MOTH for 34a Heroin found following drug test, annual one, for flyer.
Can't see where "annual one" fits in.

[Lie-in King]

That'd be your "MOT" (annual test)

[mightymouse]

Now WHY didn't I see that?

Thanks very much.