Sweet peas ending

My sweet peas just about seem to have finished flowering now, although did pick a small bunch today.
What's the best thing to do when they've finished?
Chop down/ pull up/ compost/ etc?
Thanks
Mrswashi

I agree. Let some go over and get to brown pod stage andlet them dry out completely.

I keep the seeds in a brown paper bag until next Spring. Haven't bought sweetpea seeds for years.

Did use to sow in the October but did a trial and found that they didnt do any better than the Spring sown ones, so I stick to the spring.

I pull up the plants and compost after I get the seeds.

I always let a few go over into seeds to plant in the cold frame on October - free plants :-) I've been doing this for years. Then when they are all brown and dead I compost them.

Don't know why but it has never occurred to me to do that with sweet peas What a good idea! 
Will the fact that the leaves are mildewed make a difference to the quality of the seed?

I've checked myy Giant Navy (which were neither giant or navy  but pretty anyway) and they are covered in white and green insects. I've attacked them with a bug spray in the hope that I will still get some seeds. They haven't done all that well this year.