Thank you all very much for contributing! I'm going to head to both again tomorrow. The guys I spoke to at Sibson were incredibly friendly and helpful but I tend to agree with the opinions that Leicester has its advantages, being busier and having paved runways.
Its made it very difficult to decide because obviously I'd want the sort of personal, helpful service you're bound to get at Sibson but at the same time, I am hoping to keep training towards a CPL and so maybe it would be better to get the PPL at a busier airfield?
Thanks again!