Short tomatoes

My neighbour on the plot has half a dozen or so tomato plants in his greenhouse. This evening, he was complaining that they were flowering and setting fruit, despite only being 18 inches or so tall. He couldn't tell me what variety they are, but did say they're 50/50 cherry and normal tomatoes.

He's intent on nipping off the flowers and fruits, despite not knowing whether it's the right thing to do or not, in the belief it'll help them grow bigger. Personally, I'd leave them and be chuffed to have a crop, but who's right? Should you nip out flowers if the plant's still too short?

I wish I had his 'problem' 
Because of the cold spring my toms spent too long indoors on the windowledges, so they grew quite tall before they grew their first flower truss

If this hot weather persists he should stop the plant after 5 or 6 trusses.