You might have noticed that those morons in Government are paying farmers to plant trees to do away with fields. There are already too many people for the food we can grow on these islands, so if you can , plant trees that will produce food in forests.

So far Walnuts, and Chestnuts collected in Wales by Lostit are growing, and there has been fair success growing the kernels collected from Monkey Puzzle trees. Araucaria have to have both genders of tree reasonably close to bring fruit from wind pollination. Anyone know how to identify the females and take cuttings - it is often easier to get cuttings to taken from seedlings to root than from trees. Expert knowledge needed. We hear of twelve or eighteen Monkey Puzzle trees being able to feed a person for a year.

Small Walnut trees will need a lot of protection from Deer. Many trees need protection from squirrels. Both make good eating,

I fully endorse your sentiment to "plant trees that will produce food in forests", but I'd say plant 'em in most other places too.

There are NOT "already too many people for the food we can grow on these islands" ... there are too many animals on (intensive and extensive) farms being fed food that would better feed people directly, or living on land that would grow far more food if used for direct human consumption.

And where other crops will not grow - plant trees. Trees provide timber for many construction products, for furniture and innumerable other articles, fibre and pulp for paper, textiles (e.g. rayon), and synthetics of many kinds, resins, dyes, drugs, etc, as well as a renewable source of heat and energy.

Trees can contribute to a solution for many of the problems that challenge humankind: to meet the needs of an exploding population from the resources of a finite planet; to maintain water supplies, check floods, droughts, soil erosion and desertification and to reverse global warming, to name a few.

There is a convincing case for phasing out animal farming and giving the land released to forests - convincing, that is, to those not locked in the age old belief that animal products are necessary for human health.

See  http://www.iwvv.org.uk/treesforfuture.htm

What a great idea! It bridges the gap between funders who want trees planted with permission, and enthusiasts who would get bogged-down if they tried to get permission.

I got a bit carried-away with a simlar idea which is simply to buy ultra-cheap fruit trees that are sometimes on offer in February and spring, and to plant them without permission. The blog post is on  http://veg-buildlog.blogspot.co.uk/2016/02/guerrillafruit.html and the gist of it is the list of shops that sell special offer fruit trees, so I'll quote that bit

aldi.co.uk/store-finder - has an offer page on their web site
storelocator.asda.com - apple tree offers sometimes in the porch, not on the web site
bmstores.co.uk/stores - the ones with garden sections
lidl.co.uk/en/785.htm - has an offer page on their web site
poundstretcher.co.uk/find-a-store/ - has an offer page on the web

All of these offers are below £10 a tree.

B&Q have a 10% discount card for anyone with white hair / over 60 on Wednesdays, including sale items. Trees in stock most of the year.

Homebase fruit trees are £10 in stock most of the year and reduce occasionally, like when trying to make space for Xmas trees or during blizzards.

Norfolk's  http://www.sandylanenursery.co.uk/catalogue-retail-2015.html has a clearance offer on bare root apple trees usually only sold to big wholesale customers. Offer details seem to be £5+VAT and delivery, hoping for bulk customers.

Anyone who knows a regular shopper at one of those shops could find out if they ever reduce thier sale stock, which I guess is very rare but possible.

I've also got some of the general links that every other similar blog post has, and stuff about cheap spades but Indiemedia readers probably know how to cadge a spade.