It seems they won't be closing until next October...

"The Museum is due to leave Holker, but that has now been put back a year, so we will now close at the end of October 2009. We have a new site, and having received planning permission are now finalising detail design, awaiting building control approval and planning the build process. The new site is in a village called Backbarrow, close to Newby Bridge, at the southern end of Lake Windermere. All being well we intend to re-open in time for Easter 2010."