Outfit: Swift Speedbird 490 Mondeo Estate
Location: West - North Yorkshire
Site Reviews: 27
Gallery Images: 3
The Caravan Club give details on their website of indoor/outdoor storage - if you're not a member email me and I'll email you the download (having just downloaded it!).
You can also 'Google' Garage Mort, for any destination, in Pages Jaunes!
Having looked through the list, there doesn't appear to be anything in/around that area which specifically offers indoor storage.
We've just stored our caravan indoors in the Languedoc, easy access to Toulouse Airport for international flights, if that's of any interest.