Just one person involved in the HSBC tax evasion scandal has been prosecuted, according to MPs reviewing HMRC.

HSBC was found to have helped customers to evade tax in the UK through its business in Switzerland. And despite being given a list of 3,600 people involved, the Public Accounts Committee said that just one has been prosecuted by HM Revenue & Customs.

In fact, HMRC has prosecuted just 11 people over tax evasion in the past five years - described as "woefully inadequate" by the committee of MPs.

Instead of prosecutions, HMRC has focused on given reduced fines to guilty parties who come forward.

Threat to tax collection

The Public Accounts Committee said HMRC is "still failing UK taxpayers" and said its customer service "could be considered a genuine threat to tax collection".

Meg Hillier, chair of the committee, said HMRC must "rapidly improve its customer service, previously described by the PAC as abysmal and now even worse".

In 2014, 72% of customer service calls were answered. But in the first half of 2015, just half have been answered, and only 39% within five minutes.

HMRC said it has recruited 3,000 people and stressed that its customer service had not impacted on its ability to collect taxes.

"We are disappointed that the Public Accounts Committee has overlooked HMRC's record results, which include collecting a record £517bn in tax revenues," an HMRC spokesperson said.