Scott Mitchell has accused the government of failing to deliver on "promises made to me and Barbara in 2019".
Christopher Biggins, Matt Lucas and David Walliams were among the guests.
There have been huge losses from the worlds of TV, film, music, sport and fashion over the last 12 months.
"She was so sharp, she knew the audience, and kept actors young and old in check."
"This outpouring of support has filled me with pride and been a huge comfort to me."
Mackenzie Crook 'Really Sad' Barbara Windsor Won't See Her Worzel Gummidge Character Reborn In Reboot
The late EastEnders star appeared as Saucy Nancy in the late 1970s and early 80s TV series, a character who has been reimagined by Mackenzie.
"She was properly sick and then she turned it on – that's the pro she was."
The Pat Butcher actor paid tribute to her former EastEnders co-star.
From her breakthrough in the Carry On films to her defining role as EastEnders' Peggy Mitchell, she had been on screen for over 60 years.
Remembering the Queen of Walford.