Water Stressed Pumpkins

Hi all!

I was recently given a small patch of allotment to look after as the owner is finding it hard to keep up with the large area he has.
I decided to grow Pumpkins this year to save money at Halloween and just because I've never grown them before!

I planted the seeds back in February I believe, put them in the conservatory on the windowsill and covered the seed tray in cling film. It took a while, they were the last seeds to emerge, but they suddenly shot up out of the soil overnight and were doing so well! They were healthy, strong and I was very pleased with them!

Come early April, the weather warmed right up and I didn't think we would be having anymore frosts in the area (Norfolk) so I planted them in the ground on the allotment.
At first they were doing well and I covered them in netting to keep the pigeons at bay.

I run my own business. Work suddenly became hectic and I just couldn't find the time to get to the allotment to water all my plants - and this was a dry period.

I finally managed to get up there only to find my pumpkins are yellowing and wilted. I'm so disappointed in myself!

What I would like to ask is firstly, does anybody think they still have a chance? Secondly, I added mature horse manure to the soil before planting the pumpkins - could they be suffering from a burn from the manure?
My carrots, tomatoes and potatoes are all doing well still - its just my pumpkins.

Any help is much appreciated - and yes - its all my fault I know