A London cyclist has written to Mayor Sadiq Khan and Greenwich and Lewisham councils about the use of retractable dog leads. Robert Perkins suffered slashes to his face, back and clothes as a result of an ‘almost invisible’ lead stretched across a path in Blackheath.

London News Online reports that Perkins was cycling along a path near the pond on Prince of Wales Road at around 8pm on June 12 when the incident happened.

“Travelling south on my bicycle, I was completely unaware that the dog leash was stretching across the path until colliding with it. The friction of the moving cord cut through my clothing and the cord jumped to my face causing the injuries. The dog’s owner was also injured by the leash.”

He added: “The leash was so thin it was almost invisible and it was so long, both the woman and her dog were both some distance from the path. I went to the hospital for treatment but did not need stitches – I am just hoping the slashes will heal up without too much scarring.”

Perkins wants to highlight the potential hazard of people using retractable leads across pathways in open spaces.

“I am likely not the first cyclist that has been involved in such an incident, and fear I will not be the last. While I realise that the green spaces must be shared by many users, my understanding is that dog owners are legally obliged to keep their dogs under control at all times in public – something which is effectively impossible with the use of these types of leads.”

Nicholas Sanderson, senior policy officer at Sustrans, walking and cycling charity, said: “We’re very sorry to hear that Mr Perkins was badly hurt while cycling on the path on Blackheath.  Shared-use paths like this provide valuable spaces to travel, free of traffic. Sharing the space requires everyone, including walkers and cyclists, to use paths carefully and to be mindful of others.”

He added: “With more people travelling around London as the city grows, it’s vital the mayor and local councils continue to expand the network of safe cycle routes to support the growing number of Londoners travelling by bike.”

In 2015, a man knocked off his bike by an out-of-control dog on a retractable lead won a £65,000 payout from the dog’s owner.

Anthony Steele had suffered a fractured skull when the dog leapt into his path while he was training for a Coast to Coast to event in Heysham in 2012.