There is a wondeful place to camp just south of Welshpool. If you are hiking north you will walk past a mobile home site, on your right, set in the grounds of a mansion, which is now the sites hotel, resturant and office area.
I walked in (2015) and the groundsman gave me a lift on his small tractor unit, took me to a wonderfully manicured lawn in front of an ornamental pond, smashing! A fiver for the night.
That evening I dined in the restaurant with 4 people from Canada. A very good meal and great company.