Mosaic Virus ???

[Maf]

Some of the leaves on my courgette plants look like below.

Is it Mosaic virus ? My book say that it is transmitted by aphids but my plants are still on the window sill ????

[Norm]

I could be COMPLETELY wrong but, I think it's the wrong colour for mosaic virus. Also, I have a feeling that the leaves of marrows/courgettes have mottling on them. I shall sit ready to be shot down in flames by someone who knows more than me (which won't be difficult)

[lottie dolly]

mine always look the same to,sure it's their make up,they seem to change colours the older the leaves get,as long as it otherwise looks healthy and is cropping ok,nothing to worry about,like norm i to will sit ready to be shot,only i would request a blind fold please

[Flummery]

They always go like that. (I think!)