[Christine]

Ok so I know the theory of bean trenches for runner beans. Question is - would the same work for climbing French beans? Just wondering about intermixing the two next year on one frame that's all. No-one here has any idea at all - but then I'm not asking about onions, cabbages or leeks!

[DD.]

I treat climbing French beans the same as runners.

It's just the product that's different!

Be prepared for some strange crosses! 

[Yorkie]

I'm sure it would work the same 

The only risk, which others have mentioned, is the cross-pollination of varieties so don't save seed for next year unless you're adventurous 

Edit: Snap, DD.!