The 360 acre estate has purchased a new Kubota 23.3hp G23 professional ride-on mower to add to the six Kubota tractors and mowers it has brought in the past two decades.
Wisley still operates its oldest Kubota machine, the B6200 compact tractor originally purchased more than 20 years ago.
Wisley machinery maintenance engineer Peter Anderson said: "Whenever we have bought a new Kubota, we've always decided not to trade in the old machine because they are such good, reliable workhorses. We've been running the B6200 for more than 20 years and a B1550 compact tractor for more than 15 years. They're both still going strong and while we don't use them every day, they certainly come in handy as back-up machines during busy periods."
The G23 was supplied by Kubota dealership Lister Wilder.