Cucumber not thriving

Mine are the same for about 4ft  but still producing at the tips in the eaves of the GH, even the outdoor one is too.  My CFB are the same, but not still producing.  I put it down to end of life and have resolved (with the beans and sweetcorn) to sow in two batches rather that go off like a headless chicken ( sorry V) in the spring and sowing all and everything far too early.  Spring patience is not one of my virtues.

Headless chicken here.
This year, I've made 2nd sowings of DFB and CFB, Runner beans, courgettes, cucumbers and tomatoes. Its working well. For example, the cucumbers, courgettes and beans are coming to the end of their days but the new ones are taking over. The first sowings of beans are being left for seed production since I am now picking from the second sowing.

Veggie. Do you remember when you made your second sowings?   I've not got a feel when to sow  the second lot, especially beans and courgettes to ensure a crop.   With sweetcorn I'll  probably sow half early in the GH and the second directly into the soil at the time of planting out the others.