bleached out leaves on tomato plant

REMF33

Hello
I have a tomato plant (Gardener's Delight) which I bought from a garden centre some time ago. It's only lived in doors since I bought it, although for the last two (sunny but not hot) days it's been outside during the day whilst my sitting rpoom was been painted. It's leaves have been a bit droopy for a while, and the stems don't seem as healthy as normal plants, but today I noticed that some of the leaves also look bleached.
It's been in its final big pot for just over a week. I gave it a good (too good?) watering and feed a couple of days ago. It is flowering and fruiting. I had a tiny seedling which was sitting in the same tray which also seems to be bleaching. Could this be too much water? Too much food (is this possible?)
I have never had this before, but I have also never kept a tomato inside for all its life before. One obvious concern is if it's a disease, as it is currently sitting next to six healthy looking 10 inch tomato plants (dfferent varieties.)
Does anyone have any suggestions?

I

Skandi

I'm going to go for too much sun, it's only had small amounts through a window and then suddenly bang full sun. Can be made worse by wind as well. If it is sunburn it will recover and you don't need to do anything, the rest of the plant looks pretty healthy.

REMF33

Oh it was a bit windy today. Thank you very much. I am really looking forward to being able to put things out properly. My sitting room is turning into a greenhouse!

REMF33

Just to say that I am still picking (very good) tomatoes of this plant, nearly 5 months later (although they are a bit squishy now and coming to the end.)

the enduring gardener

yep - mine are on their last legs too. It's been an average year for tomatoes.

REMF33

This plant did produce pickable fruit for many months, though. I got the first ripe tomatoes off my other plants third week of August, so only 6 weeks' harvesting time. I did get a really good crop of new to me Summerlast this year. Indigo Rose from seed were a bit meh. Tigerella not as good as usual. Crimson Crush not so good. Other varieties ok. Last year was the best in twenty five years or so I have been growing outdoors, but oh the effort (all the watering in the sustained heatwave, and then wind knocking them all over while I was on holiday.)