I had to grow some more peas & beans & have just planted them out. So fingers crossed.
Also cut & come again lettuce, rocket & peas for pea shoots in seed trays.
Even my established courgettes are coming to nothing & the cucumbers have all been eaten to bare stems by slugs each time they put on new growth, so I'd say it's probably not worth bothering with them now it's so late, unless as others have said you can buy established plants from the garden centre.