Specmaster - that's also the beauty of digital cameras. 1200 shots on a 32Gb SD card isn't a big deal, but that would have taken 34 rolls of 35mm film, say £15 each for film & processing, that's over £500! I used to assist a sports photographer back in the filmy days and you had to be fairly well assured that you'd be able to sell your shots before whacking away on the motor-drive.
Oh, and I'd say you're definitely getting good at it. Those pics are very professional looking. if you did a FB page devoted to your aerial photography I know a load of scale modellers who would go a bundle for them. Look up David Brown Photography, he does pretty nicely attending airshows and selling the shots on his website. I can't stand my brother, but he does run a high quality digital printing service in Potters Bar, just North of the M25. He'd definitely be amenable to printing and posting out your orders. Might be worth thinking about, as the actual web-space shouldn't be too pricey and you wouldn't need to stock anything.