A bicycle enthusiast has found the “holy grail” of collectors items after discovering what he believes to be Britain’s oldest bike dating back to 1819.Glynn Stockdale from Knutsford said he couldn’t believe his luck when he received a call about a long-forgotten bike in a disused barn.The 79-year-old immediately recognised the bicycle as a hobby horse and has now displayed the cycling relic in his penny farthing museum in Cheshire.The bike was discovered during a building demolition in Beaconsfield, but how long the bike has been hidden away remains a mystery.Mr Stockdale said: “I have been a bike enthusiast for 40 years and so to come across this really is the holy grail for me, it’s what you always dream of finding, let alone owning. The bike was originally made by Denis JohnsonCredit: Paul Cooper “This bike is a real find and I can’t believe I own it. I feel so lucky to have been given the chance to have this bike and it is now being displayed in the museum.”Mr Stockdale is a former interior designer and opened his museum in 1989 after having a lifelong obsession with bicycles.The previous owners had no clue the the bike was of such historic significance, and contacted Mr Stockdale when the building was being demolished to make way for a new development.Although Johnson referred to his machine as a pedestrian curricle, but was more widely known as a hobby or dandy horse.In May 1819 he introduced a dropped-frame version for ladies to accommodate their long skirts. The bike is one of 12 known to be in existanceCredit: Paul Cooper “This bike is a real survivor and it feels just fantastic to have come across this bike after all my years of collecting.”The 199-year-old bike was originally made by Denis Johnson who registered a patent for the bike in 1818.Johnson made 320 of the machines in 1819 with only 12 known to be in existence today.It is believed by Mr Stockdale that this barn find is the oldest of the dozen as Johnston would number his bikes, but this particular machine was made pre-numbering strongly suggesting it was one of the first to be built.“The bike was just found in a barn in Oxford, but I got a call to see if I was interested in it, and I knew from the description it was a Hobby Horse,” said Mr Stockton. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.