If you are training at Sherburn you should be aware that they had two C150's of which one has been sold and the other is up for sale. It may not be prudent, therefore, to go down the C150 route if you are just commencing your training. That leaves you choosing between AT3 or PA28. They have both PA28 Warrior and Cadet available for training. AT3 is quite some way cheaper but at present there are only two available so you may have to book slots well in advance because of limited availability.