My Tomato plant leaves at the very top are curling badly. Why is this and can you give me a remedy
In my (limited!) experience with tomatoes Alan, I think it's pretty common and unless there are any other issues with them they should be fine. If they're exposed to a lot of direct sun they can get a bit frazzled so if they're right next to greenhouse/conservatory glass that may be all that's wrong. There are lots of really knowledgeable tomato growers on here though so I'm sure you'll get some better advice!
Usually due to excess heat in the GH eg. 80-100 degrees. Ventilate with the door and windows open, water well if the pots, bags or soil is dry. You must NEVER allow the soil/compost to dry out even for an hour or two or your Toms will split.