Alongside pear patio trees which do OK.
I think both of these articles will help with your fruit drop problem:
https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-fruit-drop-problems.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/reasons-for-small-hard-fruit.htm
I had blossom this year after 3 years but no fruit
This article should answer your questions:
https://www.gardeningknowhow.com/edible/fruits/fegen/pruning-for-potted-fruit-trees.htm
Is it correct that you don't have to water my cherry and pear trees that are in patio pots during the winter, and should I wrap them up
If you go for more than a couple weeks without precipitation, I would water them. You shouldn't need to wrap them unless you have sustained temperatures below freezing.
https://www.gardeningknowhow.com/edible/fruits/fegen/winterizing-fruit-trees.htm
https://www.gardeningknowhow.com/edible/fruits/cherry/growing-cherries-in-a-pot.htm
https://www.gardeningknowhow.com/edible/fruits/pear/growing-pear-trees-in-containers.htm
My ceramic container is only 14 ins x 14 ins. Dose it need a bigger container. I would have to smash the container now to remove it so has not to disturb the root ball. Can that be done now and what size container and compost would you recommend? Many thanks Liam Bond
I do think that the container is just a bit small. You want to get as close to between 10 to 20 gallons as possible for the rootball to be happy. It will be ok to disturb the rootball. I wouldn't worry too much about that. Adding compost will be fine at potting up, and every 6 months to a year.
These articles will offer more information:
https://www.gardeningknowhow.com/edible/fruits/cherry/stella-cherry-information.htm
https://www.gardeningknowhow.com/edible/fruits/cherry/growing-cherries-in-a-pot.htm