Should i dig up this plant and repot it

The 50Litre pot in your link is the one i have but this is supposed to be a patio dwarf apple tree . If it needs more than a 50 Litre pot then i dont think it should be described as a patio apple tree. In addition these pots do not look very attractive in my eyes

 

B&Q has great terracotta pots that I find attractive. The 53cm one is huge and would cater your apple's needs forever.

Trees in pots in my experience need good soil (from garden, not bagged MPC which is too flimsy and shrinks), good drainage, and a heavy pot or they'll topple over. Blood fish and bone is great.

 

The tree being at that angle and the level dropping so considerably all the time, suggests the mix isn't right, but also the poor support.
Levels in pots will always drop a bit, depending on the type of plant and the general conditions, but you need soil not compost for anything woody that's staying in a pot long term. As @NigelJ has said, it's a case of removing and replacing a little layer each year, and ensuring there's adequate food - again always depending on the plant.
The bark is part of the mix, because it breaks down over time.
I still don't understand the chicken wire. If it's because of birds/wildlife digging, then it would be better to add a few rocks or similar once the soil level has been amended. Easier to remove, and looks far better. Doesn't prevent watering either, which is best done with a can [no rose] right in at the base when needed. The right mix will also prevent it drying it out as easily. Bark can be attractive as a hiding place for slugs/snails, so it could be blackbirds which are having a poke around.

 

I think i will just put some soil on top then as i dont think its wise to repot it now.

Can anyone recommend a good website that sells stakes. I can only find multipacks and really i only need one

 

Amazon sell them singly as do Most GCs

 

I would just like to say that although I agree that black plastic pots are ugly, I find that because they are black they tend to disappear and are not so unsightly. Also, you can surround bigger pots with smaller, more attractive, and cheaper pots. This is what I mainly do with roses in pots.
Also plastic pots are lighter and easier to move around.

 

I agree its only when i see them online that i worry but ive had the one in the garden for a few years now,
ive seen the teracotta b and q pots somone else mentioned in store and they are heavy to move (without a plant and soil in it) also they dont have carry handles

 

Good large terracotta pots are very heavy, I have a couple of Yorkshire long tom pots about 15 in across and 24 in deep, they get heavier over the years and are now plenty heavy enough when empty to move around.
Stick with round black plastic for your large pots.

 

i dont really do amazon and cannot go to a garden centre today so want to order one online could go get this

Garden Stake

 

Apart from Amazon most online suppliers will not sell a stake only a pack as it's not economical for them.
Why not wait until you can get to a garden centre, you don't need to do the job that urgently.

 

I think B and Q sell single stakes.

 

Yes, definitely do. Their big spiral stakes were half price recently and I bought up all the store had (only 6) !

 

so do Wickes Timber Garden Tree Stake - 40 x 1800mm | Wickes.co.uk might get it from there

 

I've always found staking plants that grow tall in pots is a bit difficult, you don't have the depth to make it firm,often the plants having roots are firmer than the stake.
I sometimes stake plants in pots by using a stake at an angle and hammered into surrounding soil, using a tree tie means you can just undo it if you need to move the pot.
Ideally I'd use the fence behind as a support perhaps screwing a bracket to the fence and fixing the tree to the bracket.

 

I've found that compost levels in pots drop very quickly with peat-free compost - my theory is that it contains a lot of material that isn't fully rotted down so it continues to rot down and reduce in volume. A soil-based compost won't shrink down as quickly.