Hi Keenongardening and welcome to GoY are you saying there are only 6 fruits on the whole plant? I suspect the problem is your electric toothbrush... you need a child's paint brush to hand pollinate or simply tap the cane the tomato plant is attached to. The toothbrush will have scoured out the pollen but not put it on the next flower. If however you are saying that there were 11 buds on one truss but only 6 set as tomatoes this is fairly normal.

How bizzare to use an electric toothbrush to pollinate - still they must be really clean!!

on warm days I lightly spray overhead and keep the air fairly humid, I very gently tap the plants ( usually when i remove the side shoots is enough movement) cold wet days and i keep the atmosphere drier

I think the idea of the toothbrush must be to vibrate the plants to spread the pollen, but tapping the plants at midday is probably just as effective. I'd agree with Pamq that spraying is important as in greenhouses lots of tomatoes suffer from 'dry set' which is where the pollinated flower just falls off. With so many flowers it sounds like your tomato is a cherry type, so it should produce lots of fruit.
As you've pinched out the plant (bit early to do that!) try allowing one of the sideshoots to develop into a main stem and see how the flowers do on that. Professional growers even lower the plants to the ground once they've removed the fruit to keep them growing longer and longer despite the restrictions of height. A greenhouse tomato should continue to produce fruit until the autumn and well into November unless there are early frosts.

Bertie - you are a star! Thank goodness someone knows their toms. better than I do...

Hi everyone, thanks for your responces, I don't feel alone in my gardening adventures any more.
My tomato is beefstake variety, not cherry. I pinched the tops off on advice of one of the sites that to perform well each plant should have no more than 6-7 trusses and each truss should have 4-5 flowers. As my plant is over 4 ft tall and had 10 trusses already with lots of flowers that managed to set only 6 fruits between them all I decided to restrict the growth. I read about toothbrush idea on the Internet as well and only used it to vibrate the trusses not to get it inside flowers. Now I stopped to use the brush and see if the rest of the flowers will do better.
Thanks again.

I also grow some courgettes. There are a lot of flowers and large leaves, but some of them started to get covered in brown spots. It that a sighn of a desease or I just cut those leaves off and not worry?

I 'm quite amazed at 10 trusses in 4' of plant they must be very close together on the stem, maybe the plant over reached itself and was unable to sustain that amount of fruit ( my cordons are at the moment about 3' tall with 2-3 trusses and i won't stop them until they are almost at the top of the greenhouse wit 4-5 trusses, this has been normal for me over 20 years 10 in 4 feet --- what variety is it ?

And beefsteak are big toms. usually. Like Pamg our toms. will go up to almost roof before we stop and have, maybe, 6 trusses.

I'm just wondering-- are you removing the side shoots to turn them into cordons ?