I think it must increase. Like RickRob, I can not believe it is worth £18k now. And that is why I think it will appreciate. But only if it is kept immaculate. The mileage might be a bit high, and I am not sure if it is the right spec. I would have to have a lot of money sloshing around before I chanced my money on it.
So I don't have it as a good investment, but it may well increase.