Gigwise quotes Frayling as saying: "Nobody likes enforcing curfews. We'd all rather the artist play on. But we have to for future shows and licences, and we could do with artists appreciating that a little more. It is the HSE who are being disingenuous here.
"Live Nation explained fairly that it was to allow fans to get home safely. Having a 60k crowd cross Park Lane mixing with traffic would not be ideal.
"So it was 'in the interests of the public's health and safety' to shut the gig off."
The 90,000 capacity Wembley Stadium is one of the biggest live music and sport venues in the UK.
Springsteen himself has been joking about the incident at other live dates, opening his Dublin gig with 'Twist and Shout', the song he was about to sing with McCartney before being cut off, and holding up a sign for the audience saying 'Only the Boss says when to pull the plug'.
Watch a video of the controversial incident below: