Pumpkin is one of the squashes and, as such, is vulnerable to Blossom End Rot, just like tomatoes. It's caused by erratic or inadequate watering which mean the fruit goes short of calcium when it most needs it because it takes the calcium up in water. Sometimes there may actually be a calcium shortage in the growing medium, but its usually a watering issue.

As for the tomatoes, your description does not fit blossom end rot, and a photograph showing the problem would be useful.

Hi Bamboo,

Thanks for your message. I think I'll have to look at my watering habits next time round, I've got a moisture meter that I use most nights to check their level.

The tomatoes are definitely going soft and squishy at the stalk end, I couldn't find anything for this only blossom end rot but it's the other end that's rotting.

I've got photos but not sure how to include them - any ideas?

I've put 2 pics in my picture section, not sure if you can find them, the're both called stalk end rot tomato.

Its' okay, I found the pictures. Looks like a fungal problem such as gray or white rot, caused by two different fungii. Its uncommon in the UK, but not impossible, usually caused by not enough air flow, plants too close together, too many fruits on the stems, and water droplets on the top of the tomatoes. Does that description of conditions ring a bell? It's spread by spores, but they'll only develop into an infection if conditions are right - which would be muggy, still air, warm, cramped and damp or moist. The only treatment is to remove anything that looks soggy or infected as soon as you notice it. It may be you need to increase the space between plants for next year, and improve air flow, and water only the soil they're sitting in, not the foliage (if you do that, don't know). Probably best to thoroughly clean and sterilise the greenhouse before you start growing them again next year.

Thanks Bamboo,

Overcrowding was definitely a problem, all the seeds I planted came up so I ended up with more plants than expected. I'll know better for next year. What's best for cleaning/sterilising?

Probably a good wash down with Jeyes fluid solution.