HI
while it was 3 or 4 years ago now, Oxford sport flying at Enstone were very good and as they use ventures are much cheaper than Cessna flying.
not sure how close they are to you tho...I went and stayed and did the silver c to nppl conversion.
Whatever route you take, Have fun and I hope you have a great soaring season next year, you will be amazed how quickly you can get a silver c if you push.
GK