Sound Level in Hyde Park, London.

I once promised myself never to go to a concert again, out of fear of worsening my tinnitus. Now I'm seriously considering buying a ticket to Tom Petty & the Heartbreakers only European concert of their 40th anniversary tour and flying to London to go and see them in Hyde Park.

I'm under the impression that concerts in Hyde Park aren't as loud as normal concerts.

1. Is that true?
2. Are standard yellow earplugs the best to wear? I do have a set of Earfoon plugs, but they're 10+ years old and not the greatest fit anymore, even though they mostly do their job.