its possible, but you dont fill in the normal planning permission forms - there should be a farm / forestry notification application, or there is another form you can use which is an application for a certificate of permitted development.
Do you have the ear of a planning developer you could ask. Just because we were told by the council that we needed to apply for a certificate of Lawful Development in order to do 28 days camping on our farm. Our planning developer told us that although it was a useful bit of paper to have, it was by no means compulsory, and it would be up to enforcement to determine the legitimacy of the development. As long as you have read the relevent bits in the T&P planning act, it may well be that the council are just being beaurocratic for the sake of it (theres a surprise) and creating revenue. They do like to know what everyone is doing too.
The notifications and certificates are just written confirmation from the council that you dont need planning permission. To us, it just seemed like we were going to have to pay them for something which we already knew, and which would take ages to be processed, so we didnt get one and did it anyway.