I have two thoughts on this, I took my step-daughter for a 152 and Firefly combined flight last August. We were offered the certificate and a video of the Firefly flight at extra cost. At the time I thought the certificate should have been free and the video was a bit pricey.
Second, I have recently started flying at Stapleford having checked costs at flying schools local to me. I found, taking travelling expenses and time into consideration that Stapleford were the cheapest around. What sealed it for me was when I visited to get costs and information for myself, I was introduced to an instructor who spent 15-20 minutes answering my questions and gave me his mobile number in case I had any more questions. He is now doing my training and I have no regrets.