toms and courgettes - loads of flowers but no fruit

Do I need to pollenate them myself do you think?

Sounds like your assistance is highly recommended  

I've never grown courgettes in a greenhouse before and normally let the birds & the bees get on with it.  Before panicking, are you getting both male & female flowers at the same time - it might be down to wrong timing.  If you are and nothing has happened, then you will have to identify which is which (females tend to be big flowers with an immature fruitlet at the base) and spread the pollen from the male onto it.

For tomatoess, I gently cup my hand under the bunch of flowers and gentle shake going round all the other bunches.  You could use a soft brush like a make up brush if you wanted.

Don't worry about being behind, you're bound to be, but if yours are planted with plenty of room, I wouldn't mind betting that ultimately you'll get a better crop than a plant cramped into a greenhouse.