Curling pea leaves

Any chance of a photo

https://i.imgur.com/Rcb5Dl9.jpg
https://i.imgur.com/oAXzT5u.jpg

It's not a severe case, but the curling is noticeable, especially compared to my previous crop of the same pea variety.

Actually, I took another look at the other plants while I was there, and I think the grape vine has some minor leaf cupping on its newest leaves, as well (so minor that I didn't notice it until I was actively looking for it), so I suspect it may actually be a minor case of weedkiller contamination.
The field the horses were grazed in clearly hadn't had any herbicides used on it, but maybe some bought-in feed was contaminated? I shan't be getting any more manure from there, at any rate.

It must be a very mild contamination, though, because only these peas and possibly the grape are affected (they are in the same bed, and I think I used more manure on on that one than on the others, although it's hard to judge), and even then only pretty mildly affected. The brassicas, beetroot, leeks, raspberries, and copious weeds growing in beds given the same manure all show not even the slightest sign of contamination (the leeks and some of the brassicas I even intentionally put some chunks of manure in the bottom of the planting holes, for extra water retention).

Well, with a contamination this mild, with any luck the soil bacteria will have dealt with it all by next spring.

It doesn't look like aminopyralid contamination to me, or if it is it's very minor. I don't think brassicas suffer from it, so that's probably not much of an indicator?

I think it may be a very mild case, especially as the grape seems to be cupping a little, too. It doesn't really seem to be affecting vigour, though, so I guess it's not much to worry about.
It is odd that it's not affecting anything else, though. Raspberries, especially, are supposed to be very prone. But if it's not herbicide contamination, what else could it be?

Maybe I should take some soil samples and put some tomato cuttings in them to test it.

It looks quite normal to me and, if it did look ever so slightly different, I'd put it down to the weather.

as a past UK pea growing Champion, I think VC is spot on.

They're definitely noticeably curlier than the first lot I grew (which weren't curly at all; the leaves were perfectly flat at all stages).
But if you say it's probably nothing then you're probably right.

The pea leaves seem to be recovering now, and the plants are still growing strong.
Still to soon for results from my soil test: the pea seeds have all germinated, but they are still less than an inch tall, so too early to tell if there are any issues.

I would be inclined to agree. They look exactly like my peas and i'm rather happy with them.