I just hire the ones they have on offer. Usually get an open face helmet myself.
It's a pain I can't make this guys, but seeing as I'm already booked to go on Friday "evening" I can't really afford two in one week

How did you get on in the end?
Great day yesterday with Nick, couldn't have asked for a better day, lovely weather, nice and quiet (no queuing which is a rarity at Bedford!) so lots of time out on track, think I managed about 5 or 6 outings on the day covering about 120 miles of track time.
The car itself was great, so confidence inspiring and had so much to give, tyres were brilliant, a fair bit of graining but once I had some heat into them they gripped fantastically and were very consistent.
Only downside were the brakes, went to the day with already slightly dodgy disks, vibration/juddering at high speed and throughout the day they got worse and worse, once I had some heat in the pads they seemed to stop ok but through the wheel they felt really bad and sounded horrid too so by the end of the day I had little confidence in them, some new disks should sort that out.
I've still got 1 video to upload still but have 3 uploaded so far which are below, the 4th session video I have a mild outburst when the Porsche I'd just got past looked like he was trying to overtake again but on the tightish kink of the circuit, fortunately he didn't make the move!
In process of uploading the 3rd recorded session and will post later...