Originally Posted by
aamaci
Another thought, what about looking into the cost saving of taking a high voluntary excess, say £1,000, or more, across the entire policy? Use the policy as a "major losses only" one. Are you likely to make claims under £1k or can you afford to pay these out of your resources? This would remove the attritional loss risk from the insurer, which would make the risk more attractive and should reduce the premium significantly.
Maybe worth investigating...my entire buildings and contents cover with M&S is about £380 with £1k excess (although my watch collection will be significantly less value than yours OP).
A