Police Scotland has now submitted "an initial assessment" to the Crown Office and Procurator Fiscal Service after investigating an alleged breach of coronavirus rules by Margaret Ferrier.

In a short statement, the force said they were still "carrying out further inquiries".

Details of the investigation came as the ex-SNP MP made her first appearance at Prime Minister’s Questions, since she admitted breaching strict Covid travel rules.

The SNP withdrew the whip from Ferrier after it emerged that she had travelled to London and back after developing coronavirus symptoms.Her journey to Parliament happened after she’d developed symptoms and the return leg occurred after she had received a positive diagnosis.

Ironically, the MP, who failed to self-isolate, was questioning Johnson while we was being forced to self-isolate.

The Tory leader was taking part in the session from No 10 as he is currently quaranting after attending a mask-free gathering with Covid positive Ashfield MP Lee Anderson.

Ferrier - who was also asking her question remotely -  raised the plight of a constituent who applied for the UK government's EU settlement scheme in September 2019 for her and her son.

However, fifteen months on, she is still waiting for a decision on her application.

Ferrier said: "Will the Prime Minister give a cast-iron guarantee that my constituent’s application and all other outstanding applications to the scheme will be concluded before 31 December 2020?"

The Prime Minister said the case was "now under urgent review and a decision will be made shortly."

When details of Ferrier's rule flouting emerged, Nicola Sturgeon called the behaviour “utterly indefensible” and urged her to quit as an MP.

However, the Hamilton and Rutherglen MP says she wants to stay in the job. She told the Sun on Sunday she’d “panicked” on getting the test result and felt she’d no option but to go home, given that she has no flat in London.

She told the paper: “It may be a serious error of judgment. I’m not denying that. People may be saying, ‘you should have known better, you’re a public figure’.

“But at the end of the day it still hurts. You then think, ‘is all that hard work and dedication just wiped away?’”