Also in attendance on Friday were BBC and ITV sports presenter John Inverdale, former BBC presenter Suzi Perry, radio host Paul Gambaccini and Green Wing star Pippa Haywood.
Prog-rock icon Rick Wakeman performed a rendition of his track Gone But Not Forgotten – which he also played at the memorial of former Countdown host Richard Whiteley.
Wakeman said in a post on X on Thursday that he was “very proud” Walker’s wife Tiggy, who cared for him during his lung disease condition and helped with producing his radio show at home, had asked him to perform at the funeral.
Tiggy paid tribute to her husband on 31 December, saying he remained his “charming, humorous self to the end”.
“Bless that extraordinary husband of mine, who is now in a place of peace,” she added.