Mangetout

I expect mine are too! As long as they still flowering and fruiting at the top, don't worry. Water and feed, if you feel you should.
As you can tell, I just let mine get on with it.

That's probably what's going to happen, the tops are still producing and flowering so what's to worry about. Sounds like a good philosophy all round.

Just looked at mine - they're yellowing at the bottom too. Am I worried?..............Nope.

Peas don't really like hot, dry weather. If it cools down a bit they might perk up again. I think our Oregon Sugar Pod are approaching their end, which isn't worrying because they've produced about 4 kilograms!

I have itchy fingers so I've been seed sorting again - this time its Mangetout peas.
Going to experiment with a January sowing of a dwarf Sugarsnap pea (Jessy, Delikata or Norli), started indoors, then planted in the GH in a pot that can be moved outside in spring.
The Bijou sown a couple of months ago in the GH are still alive and flowering which makes me hopeful for a new sowing.

Back to Mangetout and Peas.

At this stage in the years MT are going scraggy and yellow at the base, the 'pods' are becoming distorted and smaller, and only to tips are thinking about growing. Is it time, then, to pull them up and plant successionally or give them a feed and hope for the best? I never know when to give up on them.

Can’t help. Mine have only just started producing.

Sow some more, so you have seedlings ready to plant out. Some of mine have gone to seed, in the pods. I'll leave those to dry out. I think the hot dry weather is to blame.

I think I'll pull the up. I've got some Snak Hero in the wings to plant out, but it's likely to be a bit late to sow more ordinary MT now, but I'll give it a go.

Is it normal for my Bijou MT, which are now say 5ft tall to be yellowing at the base or should I be feeding/ looking for disease?

 This is your post from 23 June 2022 , on this thread. Sound familiar?