Can anyone help my tomatoes please?

[BSJohnson]

They’ve been flourishing, and the first couple were ripe last week. Today, when I checked on them, the skins of a couple of them have gone a bit weird.

They still feel quite firm, though, even though they look like they’re starting to soften and wrinkle.
Could it be the weather recently? (I am in London, so had mega heat on a Friday)

Are they getting enough water? Probably need a drink twice a day in heat in growbags.

We soak ours twice a day as they dry out really quickly. And we are in the NE so not as hot as you. Just looking at the picture, the soil looks dry. also, remove that snail I can see just in case he and his fellow friends are up to no good. Have you been feeding them at all as they have been growing? They look like they have been lacking in nutrients.

Thanks @Walkacrossthesand and @FrolickingLemon.

I’ve been feeding tomorite every couple of weeks, and I have removed the snail! Eagle eyed there :)
I asked ds to do the watering yesterday, thinking about it, so maybe they didn’t get enough water. The leaves weren’t wilting at all, though.
Anyway. I’ve soaked them thoroughly, and it’s not got any worse today, so fingers crossed!