This is extremely sad to hear - but Mike was 90 and was active musically right up to the end. I saw a couple of the last gigs - Lyme Regis in 2024 I think and Torquay last December with his 'Band of Bands'. Both occasions memorable. First time I saw him was on the 'Art Wolf' tour late 90s I think, to my mind this was one of his and Kate's best projects. I also saw gigs with the Rossini orchestral group, the trio with Chris Biscoe doing 'Love or Infatuation', the 'Village Band' and the Devon-based big band with Lou Gare, Dave Holdsworth and Alan Wakeman, including their recording of 'A Bigger Show'. Such an imaginative musical mind.
May he RIP and condolences to Kate and the Westbrook family. I hope Kate continues with performances of Westbrook alumni.
Richard Williams posted a good obit for Mike in the Guardian:https://www.theguardian.com/music/2026/apr/12/mike-westbrook-obituary