The show, which follows people living with challenging conditions and their attempts to find love, potentially aired its "best ever moment".
Richard, who has been on the programme before, was back for a new date, but only if they lived within his five mile radius.
One viewer tweeted: "Five mile radius….. I struggle to get a match on Tinder in a 25 mile radius, I'd be absolutely fucked if I was this guy #Undateables."
"His five mile rule doesn't sound quite so odd now I've seen the car. #theundateables #undateables," posted another.
The Undateables: Was Richard's 'F**king Kent' the BEST show moment ever?
A third said: "Undateables magic moment – Richard, 'I'm a good dater, in my five mile limit!!' Brilliant Richard."
During the episode, a matchmaker phoned Richard to say: "It's good news. A match has been found for you," to which the excited hopeful replied: "That's good."
"Her name's Lucy, she lives in Ramsgate," the matchmaker continued, much to Richard's annoyance, "Where the hell's that?"
"It's Kent," she revealed, prompting Richard to shout: "F**king Kent?"
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One viewer noted: "Love the near-continuous stream of 'F**king Kent!' under the #undateables hashtag right now."
"Well… I've learnt that nobody is ever going to make an honest woman of me now that I live in F**KING KENT! #theundateables #undateables," posted another.
A third giggled: "Tonight's Undateables is so funny.. when Lydia phones Richard to tell him she's found him a date.. but over his five mile limit! x."
"Knackered" after the long journey to Ramsgate, Richard admitted the drive had pt him on edge, put evidently didn't put him off of his game.
The Undateables continues next Monday at 9pm on Channel 4.