Nothing happened to the flight because lightning has no effect. Great time to see it - that is what our customers thought anyway.
Here is just one comment from the message board as an example:
I attended the 1st March course in Birmingham.
Paul & Richard
Flying without fear
Premium courses: Manchester April 19th; Gatwick April 26th; Children Gatwick April 26th; Leeds Bradford May 17th
Ground courses: Gatwick* March 8th (FULL); Bristol* March 29th; Heathrow* May 3rd