Walkers have been warned to avoid a dangerous invasive plant that has been taped off ahead of removal.

A large Giant Hogweed plant, which if touched can cause serious blistering, was reported to the Canal & Rivers Trust on the Grand Union Canal towpath near Apsley Lock over the weekend.

It is apparently thought to be an isolated example but the species is known to spread rapidly due to exceptionally high seed production and germination rates.

The plant's sap can cause burns which make skin extremely sensitive to sunlight, blistering "badly" if exposed to it, according to the Woodland Trust.

This afternoon (June 3), a Canal & River Trust spokesperson said: “Giant hogweed is an invasive non-native species, and contact with its sap can cause skin to blister.

“It has been taped off by our team while we await its removal by specialist contractors.

“Members of the public are advised not to touch it.

“Any sightings should be reported promptly to our customer service colleagues.”

Giant Hogweed was first introduced to the UK in the 19th century when it “escaped” and naturalised in the wild.

It can now be found throughout most of the UK, especially along river banks as the seeds can be transported along water.

If someone does get the sap on their skin they should wash the area “thoroughly and immediately” and avoid exposing the area to sunlight for a few days.