When I was watching last night - noticed a few things! :lol
First of all they bid on EVERYTHING the split second it comes to air (if it's not been in the catalogue) - and they do seem to bid on almost everything in the catalogue as well, when it's at £0 - certainly yesterday that is what they did.
Also "they" did have a bit of a panic situation going on in chat when "they" realised their bid might actually win a multi-gem ring, I think their post in chat read something along the lines of "Please let me know if anyone else wants that ring, I bid on it by mistake, again" - so I'm guessing that scenario had also happened earlier, when I wasn't around - luckily/unluckily someone else did jump in at the last moment and outbid them on the multi-gem ring.
Pretty sure they won another ring for £100+ last night as well later.