Hi Jason
I assume you enjoyed the storms last night?! I live in Melksham and as you'll see from the link below, we got hammered. They started to develop at 7pm and were at their full strength at 10:pm before dying off at midnight.
http://www.bbc.co.uk/news/uk-england-29273833
Regarding your question on the booking process for the tours, it's very simple. Select the tour you'd like, set up your payment plan and wait for the feedback from the Netweather team. They can help with any questions you may have. I was advised to purchase storm chasing insurance through Dogtag. If you do decide to book a tour then make sure you get the correct insurance, which Paul can advise you on.
Ben