Thanks for the speedy responses people. I guess the boating day is over
Right. Let me try to answer your questions and give a little more detail.
The engine is a Mariner 200 V6 but I couldn't see much more detail then that on the engine itself so I will have to speak to the guy and get more details/service history/hours.
I guess the tubs are sun damaged as it looks to be in too random places to be friction wear. The tubes seem to be holding air for the time I've been looking at the boat but the warm weather may have helped this and I guess if the guy is selling it he could be keeping them topped up. But seems OK. I am a little concerned about the cosmetics of it but seaworthiness has to come over good looks

. I'll search for the paint and find out costs etc.
Thanks Rogue Wave for points to check out.
It doesn't appear trailered where it is currently located although the picture on the advert attached to the boat shows a low, old trailer so I guess it's a question for the owner. However, I was originally looking for a smaller boat than this and keeping it constantly trailered. With this size boat I am less keen on this option and so envisaged leaving it on a mooring so the trailer issue hadn't bothered me in the short to medium term.
The boat has also been anti fouled so this was another reason I am swayed towards mooring her up and keeping her in water rather than trailered.