FRANK'S ANSWER: No flowers this year.
Seems quite a lot of people have suffered with healthy plants not flowering, the list following may be some of the reasons.
1 Have you repotted into an extra large pot, you should only go up in pot size by 2 or 3 cm each time you pot on.
2 Have you fed with a high potash feed TOMATO FEED is the best, give it weak, quarter the strength for tomatoes but regularly.
3 Has your plant had plenty of light, but not the full sun of summer.