Welshonion

Holm Oak posts rot resistance

Unless they are thick limbs I don't think they are rot-resistant at all.

I know that oak fence posts last for a very long time, but they are made from a different part of the tree, if that makes sense.

Ilex aquifolium golden king

A male holly?

Invasion!!!! Already frustrated!!!!

Take one pair of scissors.  Go out at night with a torch and cut them in half.  They will be gone by the morning.  No pellets, no cost.  Result.

Getting rid of Blackberries

Is it a bramble; that is a wild blackberry?  It sounds like it.

 The only reall way to get rid of it in that position is to dig it up.  Otherwise you will probably have to live with it there, and just keep cutting off the shoots.

spears too fat

Baggies, they are supposed to be fat!  A fat asparagus is a good asparagus.

Moss!

Is the lawn shaded?  Or have you got a drainage problem?  Or cutting and not removing the cuttings can encourage moss.

Down among the chrysanthemums

Foxes probably put them there.

spears too fat

Most people prefer the fat spears, but cut them sooner and trim off the woody stem.

The very slim ones, or sprue are good for soup.

Identification required please

I'll start off. Number 1 is a peony.

Fruit Hedge for Exposed Site

I wouldn't call a blackthorn a fruit tree in the commonly understood way.  It makes a good stock-proof hedge, but you can grow it as a hedge, or a free-standing tree.  It does of course have nasty spines/thorns.

Blackcurrant and raspberry are not suitable for a hedge.  Raspberry needs pruning to the ground every year and blackcurrant would not grow well in a hedge.

You might be better growing conventional hedge species as a wind-break and growing fruit trees conventionally on the sheltered side.

Swifts