The countryside is stagnating, there are no homes for people on low incomes and few ways for people to make a contribution to the rural economy. allowing poeple to live on the land in a low impact way, and work it, building sustainable local businesses without getting into massive debt must be a good thing for the British countryside.
There are thousands of people in the UK who would like to farm there own land but cannot afford the half million £s needed for a farm with accommodation. The planning laws in this area are highly outdated and make it virtually impossible to build up new small farms from bare land.
The countryside is now only for big agribusiness and a playground for the rich, so there is very little new enterprise in small scale agriculture, which is badly needed.
Because of the low incomes involved it is impossible to start up a small agricultural business and pay rent/mortgage on a separate home.
Small, low impact and easily removable dwellings should be allowed while (and only WHILE) the land is being used for agriculture, either business or self sufficiency, which then often grows into small business by selling surplus, providing good local produce, and providing a fulfilling employment in the countryside, which surely is good for everyone.
The British countryside has got to let go if its NIMBY attitude, or it will end up a stale, gated community.