Other EastEnders stars paying tribute to the actor include Perry Fenwick (Billy Mitchell) and Natalie Cassidy, who plays Sonia Fowler.
Fenwick said: "John was a lovely, lovely man to work with. I'll miss him" while Cassidy said: "I never had a real granddad so John was like an actual granddad to me. He was a lovely man and I learnt a lot from him."
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