Success with fruit trees

Yesterday morning the weather looked quite promising and I anticipated a full day outside, it was a little bit breezy but nothing to worry about (I hate, hate, hate wind)

However by the time I had got the housework done the wind had whipped up to near on gale force, the skies had darkened and rain was pelting down and it stayed like that all day.
I know the forecasters claim the weekend is supposed to be dry and sunny but it seems we may have a reprieve today also - it looks fair with no wind.

Back to yesterday though and although I couldn't garden I still have animals that need taking care of and letting out so while the 3 musketeers (Atlas, Huntly & Kasa) played around in between storms I hightailed it to the polytunnel and oh my, was it ever warm in there - toasty!

I took a good look at the fruit trees to see what had pollinated and I was pleasantly surprised.
This Conference Pear had one fruit last year and it rotted and dropped off, it appears plastered in fruit this year so fingers crossed we get some viable fruit from it

I am a complete newbie to fruit growing and have no idea what I'm doing so I assume that all the trees will drop some fruit during June?
Do I leave all the fruit on or do I cut some off to let other fruit develop bigger?

This Bramley Apple also didn't produce much last year but again is plastered this year. I'm guessing the plants were still too young last year - they'd have been only 2 - 3 years old.

This next Golden Delicious Apple produces masses of fruit and was given to me a couple of years ago by a friend who's late father had grown it.

Finally I have a Victoria Plum. This plant is young (bought alongside the young Pear and Apple) and so far has not produced fruit, so I was amazed to see 1 fruit this year - just the one but exciting none the less

I also have a couple of Cherry trees, 2 Fig trees and some more Pear and Apple trees but they've been delegated to outside the polytunnel as they take up too much room. I didn't expect them to survive the winter in their buckets tbh but I had a quick look yesterday and they're all leafing up quite nice, I don't think they'll flower or produce much fruit though.

So what do I do? Do I wait for the June drop and see what fruit I'm left with? Then do I leave all remaining fruit or do I thin them out to encourage bigger fruit?