At least 4, can't remember if I declared or not. But they're definitely not itemised. The limit is either 2k or 3k each and you can cover more valuable bikes but do have to itemise. I have accidental damage and loss, and that includes forgetting to lock up and crashing in (non professional) races.
How many bikes does that cover? Been looking at specific bike insurance and it comes out at about that, not including my current contents insurance...