There was, I don't know if it's still goin, a small boat club called the New Biggin Small Boat Club up that way somewhere I can't find their site but someone might be able to put you in touch and they might be able to help,
My father- in- law keeps his boat at the south shore boat launch in Bridlington. It is run by the council and boats are charged £8.00 per launch. The lads that run the show are a great bunch and are only too pleased to give help. The only problem is that launches are made only between April and the end of October. The compound where boats are stored is then locked up for the winter and so most people take them home. We have had some good days out on the end of Flambro' Head.
Hope this helps