Largely accurate, but most clubs are 3 months probation not 6. I'm in three, none require 6 months. The only stipulation is that they are HO approved, and to get that approval they need to run a training course and require a minimum number of visits in no less than a 3 month period.
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Regarding storing my firearms at a club - no way, save for very very exceptional circumstances and with a heap of extra care and due diligence. Condition 4(a) precludes this as far as I'm concerned. It states: "The firearms and ammunition to which this certificate relates must at all times (except in the circumstances set out in paragraph (b) below) be stored securely so as to prevent, so far as is reasonably practicable, access to the firearms or ammunition by an unauthorised person." Unless you are the only person with the keys to the cabinet in which your firearms are stored, you're not meeting that condition in just about every case.