tomatoes on the vine

in Fruit & veg
Just picked some of my first toms in GH and a couple of tigerella from outside. Without exception each truss has got tomatoes on but not full . the tigerella had six flowers but ended up with only the two fruits. Has anyone got any suggestions as to why this is?
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sounds like poor pollination, are you leaving the door open to let insects in? Try some calendula in there to tempt them in.
Tomatoes should pollinate themselves - try giving each plant a little shake every time you go into the greenhouse.
https://www.youtube.com/watch?v=ux7vs38POTU
It's not uncommon, primrose. A slap (or a tickle) won't hurt the outside ones either. You can't always count on fossicking insects to trigger the self-pollination process.
I would never plant any flowers in with my tomatoes. My dad has grown them, trouble free for almost 30 years here, when I suggested putting some marigolds in there he said..you will be sorry..and I was, for the first time they attracted black fly, white fly and every other pest, so never companion planting for again.