So, I wasn't sure what all the stuff was (probably because I am not familiar with the products available in the UK), so I numbered it and will give you my best guess as to what it is.
1. Sleeping bag
2. Hammock
3. Inflatable sleeping mat
4. Tarp
Assuming my guesses are correct, it seems like a good sleep system. I personally like to stay on the ground, but even if you can't find a good hammock location, you can use the tarp, sleeping mat and sleeping bag for a good ground shelter.
5. Fire started + cotton balls
I would bring a lighter or matches as well. It is all fun and games with the ferro rod until there you have been getting rained on and then try to start a fire. The cotton balls (I assume with Vaseline) are a good fire started, but you have a limited number of them. In my experience a lighter will give more consistent use for longer.
6. Post
7. Cup
8. More pots/frying pan?
Serous overkill. A pot and a cup will do everything you need. I know some people like to carry more, but you just have a lot.
9. Backpack
Looks good.
10. I'm not sure what that is.
11. Headlamp
It's a good thing to have
12. Pocket knife
I prefer a multi-tool. You already have a cutting tool in your belt knife. I find the pliers of the multi-tool to be very useful. I would go with a just a small one.
13. Rope
It's good to have. I like to measure mine out into usable lengths both for my shelter and for other tasks. You will likely feel reluctant to cut your cordage in the field, and may end up bringing less than you need.
14. Saw
Good call
15. Mora knife
Also a good call
16. Hatchet
Good to have. You may want to bring a small sharpening stone to touch it up.
17. Mallet
Lose the mallet
18. First aid kit?
If so, good call.
19. Spoons, forks, spatulas, etc.
Lose all of them. Just bring a spoon.
Alright, so keeping in mind that I have no idea what number 10 is, a few things I would add.
1. Water storage. You said that you just didn't put it int he picture. I usually carry one hard bottle (Nalgene) and a folding water bladder.
2. Stove. There will be times where you have to cook under your tarp in the rain. A stove is great help. Also, if you are above tree line, you will need it to melt snow.
3. Water purification. I prefer a filter. The Sawyer Squeeze Filter is light and relatively cheap.
4. Navigation tools. Map and compass!
Anyway, those are just my thoughts.