No - this is the usual issue. It's nothing to do with health and safety. It is to do with insurance and litigation.
Most of the stories in the papers about 'health and safety gone mad' are completely false and the H&S Executive is so fed up with being blamed when they're quite happy for these things to go ahead that they've actually set up a specific unit to try to counter the ridiculous claims that are used by the press to *sell more papers*!
Indeed - the HSE has already responded to say that it has no issues with a good custard pie fight:
https://twitter.com/H_S_E/statuses/335475884154814464