Hundreds of people paid tribute to ‘Mr Buckingham’ as a horse-drawn hearse paraded past the firm he set up last week.
Businessman Bill Buckland was a popular figure in town as a Rotarian, Freemason and carnival organiser.
In 1982, he set up Buckingham Communication Sales which is now run by his son, Mark, as BCS Quality Vehicles.
Mark, 40, said: “I’ve not just lost a dad, but a business partner and a best friend.
“I knew my dad was loved but my mum has had nearly 300 cards of condolences, with a lot of them calling him ‘Mr Buckingham’.
“Even the vicar said: ‘I have never seen the church so full’.”
Bill, husband of Ann, 72, and grandfather to Grace, three, was a keen darts player and was passionate about horse racing and fishing.
He suffered a heart attack on Christmas Eve and died three days later at Milton Keynes Hospital, aged 76.
A collection of £2000, with contributions from the jam-packed St Peter and St Paul’s Church, will be given to the hospital.
Mark and his sister Sara, along with Bill’s sister, Helen, were chuffed to see four nurses from the hospital at Monday’s funeral.
Mark said: “The funeral was something else really. It was standing room only in the church and it was his wish to go past the business.
“A lot of people said to me it’s of course a sad loss for the family but also a sad loss for the town centre.”