Can't really help but noticed a couple of typos "recommendations, [sponsorship,] bursaries and sponsorship" (our two main weapons!) and "available until 15th May 2014, after which the sum[mer] will increase" (delete parenthesised text).

How you're fitting in all you mention on your personal /about page is beyond me. I've been considering running a code club at my eldest's school : will be interested to see your review (http://www.robpercival.co.uk/tag/code-club/).