I love the dragon cake Wem! 
blackcats, I agree about the costing. I think people really just do not realise the time and effort involved in making a decorated cake. I reckon the minimum time even for a 'basic' 1 tier cake if you include spending time thinking of ideas, maybe designing it, getting it in the oven, (not the actual baking time) and decorating it, then cleaning up afterwards is about 4 hours, probably usually more. Even at minimum wage, that's over £25 without costs added on, so you're looking at around £40-45 absolute minimum for a decorated cake really.
I am absolutely certain that some of the people I make cakes for think it's about a couple of hours from start to finish, including baking time.
I only charge costs, it's my hobby, but even so I was recently told that my £20 'quote' for a carved cake with a model that had to look fairly specific was too expensive. Well, how can it be, it's what it costs me!!! Of course, I could cut costs and use cheaper flour, cheaper butter, eggs from caged hens. I could use cheap supermarket boards/cake cards instead of drums and no ribbon, uncovered boards etc. but I don't want to go down that route and why should I?
There will always be people who want a £10 Asda cake and that is fine. However, if someone wanted a pair of shoes made to their own personal design, individually for them, a one off, totally unique, they wouldn't expect to pay the same as they'd pay for a pair of shoes off the shelf, so why should an individually designed, bespoke cake be the same price as a mass produced, off the shelf one? 