I'm afraid that sounds like blight. Pick all the tomatoes, green or not, and burn the plants. Don't compost them!

Thank will do, they are looking very sick and lot of the toms have got marks on them and very reluctant to use them will all go in the fire, sham because they looked healthy and the toms have been good we have eaten quite a few,but there you go.
All this seems to have happened inside two to three weeks.

Thanks Terry

Blight does hit fast, and it's a real nuisance. I've given up growing tomatoes because of the last two years....it just became more trouble than it was worth!

Sad day for tomatoes dug them up and put into black bin bags, taken to local skip to go to land fill site.

Oh dear. :-((((