Butternut squash not producing flowers

Hello everyone,

This is the first year I have tried butternut squash. The plants are really going for it but none of them have any flowers yet. I have been watering regularly and feeding every couple of weeks.

I live in Newcastle Upon Tyne so I am wondering if it is just not warm enough up here.

Will the flowers come later or should I give in and cut them back? (They're taking over the garden a little bit!)

Thanks for your help.