Why has a sinkhole not been fixed in five years?

In 2020, Susan Broccoli first noticed a sinkhole in Peterborough, but for five years it was unclear who was responsible for the repair. Mrs Broccoli feared the situation on Henry Penn Wall reflected badly on the city centre and the size of the hole would only increase. Plans are under way to resolve the issue but how did it get to this point and what is actually being done?
How do residents feel?

The sinkhole appeared on the public footpath in 2020 in front of the Riverview House apartment block before the path was shut in 2021.
Mrs Broccoli, 59, runs the social media group We Love Peterborough and said Henry Penn Walk looked dreadful.
"It is normally a beautiful place to walk down by the river with the boats and the railway, but at the moment we have a bit of a hole that has been here for five years," she added.
Mrs Broccoli said diggers had been on the site recently trying to repair sewage pipes at Riverview House, making it look like a building site or a bomb had gone off.
She added the footpath was a well-used resource that took pedestrians over a bridge to the other side of the city before it was closed.
However, she felt most sorry for the residents who were looking out of their homes at the "total eyesore".
Who is responsible?
There was debate over who should sort the site and Peterborough City Council said it was the responsibility of Riverview House Freehold Limited (RHFL).
Initially however, RHFL did not know it was responsible for the repairs.
After talks, RHFL said it hoped to "get the issue sorted this year".
What has RHFL said?

Dr Clive Morton has lived in the Riverview apartments for 10 years and is one of three directors of RHFL.
"As leaseholders and freeholders of the block we could not have foreseen what was going to happen and did not think we would be responsible for the repairs to the river wall and path," he explained.
"It is down to riparian ownership law, which is a medieval statute which means RHFL are responsible for the riverbank and halfway across the river.
"Peterborough City Council just adopts the surface of the footpath, the rest of the repair work is down to us."
Has the council said anything?
Angus Ellis, cabinet member for environment and transport, told the BBC: "We understand people's frustration at the lack of progress in the repairs to Henry Penn Walk.
"Officers have met with the freeholders on several occasions, most recently in December, to discuss their proposals. We hope this issue can resolved as swiftly as possible but in the meantime the footpath continues to be closed for public safety."
What are the next steps?

Dr Morton said that plans had been put forward to carry out works to fix the situation.
"Engineers working on behalf of RHFL which is owned by leaseholders, have successively developed four schemes over the last three years, only to find each scheme is either not approved, unworkable or unaffordable," he said.
"RHFL are currently seeking the consent of the Environment Agency and approval by Peterborough City Council for the latest solution to fix this very difficult problem."
What has the Environment Agency said?

A Environment Agency spokesperson said as there was a "potential risk of pollution" to the River Nene" it expected the "developer or contractor to apply appropriate pollution prevention measures to ensure that no sewage enters the river whilst work is being undertaken".
"The responsibility and accountability sit with the development company and/or contractor to fulfil this," it added.
RHFL said it had already taken action and drainage had been diverted.
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