The bizarre thing about the Ferry Marina discount is... it isn't advertised anywhere, whereas HW are very on the ball with advertising on the website and social media. The website also has some really poor images and out of date information on some of the boats. All of them have bow thrusters, but the website doesn't say that.
Looking to next year Ferry Marina prices are dramatically higher than this years (about £300) more, comically the prices increased a day before I was going to make a booking. For less money at another I can get an equally nice boat which is what I will end up doing.