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The normal way to do an "orchard" section of an allotment is to clear a small area for each tree which you can keep weed free for the first few years, and designated beds for soft fruits like gooseberries. Then either seed the rest of the area with grass, or if it's relatively grassy already just begin mowing regularly. Regular mowing will slowly get rid of most weeds while allowing the grass to thrive. It may be necessary to protect the bark of the trees from deer and rabbits with a protective collar. Once the trees are fully established, you can allow the grass to grow all the way to the trunks.Just in case the mulberry doesn't work out, there is a new variety doing the rounds which is a dwarf variety that fruits even in its first year (and delicious fruit they are too!) ... it can be grown like a soft fruit instead of a tree and is called Morus Rotundiloba - it's being marketed as mojo berry. It's quite expensive, but seems to propagate easily by taking cuttings ... so my one plant will hopefully be 6 or 7 next year!
Couple of minor additional issue. Unless there are other apple trees in the vicinity, note that Rev Wilks is not an ideal pollinator for Ashmeads Kernel or Pixie, and vice versa. Wilks is an early flowering variety and the other two are late flowering. Another possible issue, Rev Wilks does show a tendency to become very biennial (only giving a good crop every second year). One final thing - M27 rootstock will do best under mulch rather than being grassed. Stronger rootstock can cope with grassing but M27 needs to be mollycoddled.
Thanks for that, can you think of any good cookers which would be a good partner? Saying that there are other apple trees in the area. I have not decided what root stock to use yet.