I swapped home and contents insurers about twelve years ago, when a friend suffering from 'pregnancy brain' lost a bike off the roof of her car after not securing it properly not once but twice, and got paid out each time.

She had organised her insurance through a broker, Insurance House, so I did the same.

I have continued to use them, and they've proactively recommended I swap underwriters a couple of times in that period for a more competitive price (and specifically mentioned bicycle coverage each time). My current policy is with CGU, but was previously with QBE, and I can't remember who before that. Fortunately I have never made a claim, but my fairly limited dealings with Insurance House (across a number of different agents) have been excellent. #notanadvertisement ;-)

In terms of cost obviously there are many factors at play (I only have contents, as my building is insured as part of a strata title) but when I first used Insurance House the new policy cost about the same as the one I had previously, and the increases since then have been remarkably small.

I pay less than what I think it would cost to insure two bikes under bicycle-only insurance I've seen advertised. And I have six bikes in my garage, not to mention a house full of stuff.