Tomato help needed

[Sheilakins]

Can anybody tell me what this is on my Tomato leave please?

[WendyC]

It's a leaf miner of some sort. The larvae eat their way between the two outer surfaces of the leaf. Probably it's pupated and flown or hopped away already. It doesn't seem to affect the plant unduly. You could remove it if it bothers you.

[Jungle Jane]

It looks like powdery mildew too,the white areas are blotchy looking,rather than the neat trail of a leaf minor? If it is a leaf minor,you'll notice a little black dot at the end of the trails. I would get rid of the leaf.

[Scarlet]

Looks like a leaf minor to me too. I would pick off the leaf.

[Potstubsdustbins]

I would go with LM too, take the leaf of, the plants got plenty to work with.

[Sheilakins]

Thank you I've removed the two offending leaves...one leaf from two plants, the third plant doesn't seem to have any damage on it ...so fingers crossed whatever it was is now gone!!.