DL is Darlington, Co. Durham, if you mean postcodes rather than a short for something else name!
Ditto HesterF, don't touch any stone fruit until summer, I made that mistake and lost a very productive Victoria plum to silverleaf.
Since then I've joined the local Orchard Group and got lots of info from them which I follow as far as I can. I should be starting on the apples now since the last fruit is out of reach and I'm on year one of a 3 year pruning plan!
From what I remember so far:
1. Don't do it all in one year, do some over winter and some in summer for apples, over 3 years and keep looking at the overall shape as you go, stand back, wait 6 months if necessary, don't do too much and stress the tree or you lose productivity.
2. Look to create an open centre or goblet shape with the key branches so the light gets to the fruit on the north side equally and you don't let it get damp/dark in the centre area as that encourages moulds and infections.
3. Take out branches that cross and impede access to others, new wood 1/3 to 1/2 the new growth for twiggy bits, and do less rather than more if unsure.
I'm hoping to do a grafting course in February, so will be leaving some til then so I can practise with spare twiggy bits! But apple makes great twigs and logs for the fire, and I'm told the thinner branches are also good perches for chooks..