The maths is clearly wrong. Don't think anyone can dispute that. They'd need to buy more land to be able to plant that many anyway.
I live in rural Shropshire and walk daily in forests, here's my opinion:
1. The forests are actually shrinking right now, that is very, very bad. Lots of areas have been chopped down with no replanting.
2. Forests are brilliant, one close to me has been organised as a mountain bike venue, loads of tracks for bikers, they have rallies going through as well. Theirs a stable nearby too so you get horses in the forest. They also hunt wild deer and pheasants and sell at local butcher.
3. Every Forest should really be designed with tourists in mind. Make it a multi purpose area, not just for walkers, but for industry (forestry), horse riders, mountain bikers, quad bikes etc.
4. Make it very clear which tracks can't be used when forestry comission is occurring. But always have other tracks accessible so you can avoid it.
5. All of the above would require therefore more staff to be employed = more jobs in rural area.
For Farmers:
1. Higher subsidies if they plant trees on their land.
2. Higher value for money if they decide to sell their land to the Forestry Commission.
3. Access to the land they decide to sell.