Watching Only Connect and the first two clues were:
W: Andy Williams
O: Alice Cooper, in honour of Groucho Marx
And the chap with the Rainbow tattoo got it! They paid for the reconstruction of those letters of the Hollywood sign.
I know the sign fell badly into disrepair but I’d never thought about who paid for them. The full list (at a cost of just under $28,000 each) is:
H: Terrence Donnelly (publisher of the Hollywood Independent Newspaper)
O: Giovanni Mazza (Italian movie producer)
L: Les Kelley (originator of the Kelley Blue Book)
L: Gene Autry (actor)
Y: Hugh Hefner (founder of Playboy magazine)
W: Andy Williams (singer)
O: Warner Bros. Records
O: Alice Cooper (singer), who donated in memory of close friend and comedian Groucho Marx, and who joked that he would also donate an “O” from his last name
D: Dennis Lidtke (businessman)