STEWART Hosie is to step down as the SNP’s deputy leader in the wake of the so-called “SNP love triangle”.

In a letter of apology to Nicola Sturgeon – who is due at Westminster tomorrow to address her party’s MPs – the 53-year-old politician, who represents Dundee East, says he is sorry for “any hurt and upset I have caused to friends, family and colleagues. That was never my intention”.

Read more: Exchange of letters between Nicola Sturgeon and outgoing deputy leader​

He also tells the First Minister that he will not seek re-election as the deputy leader at the SNP’s annual conference in the autumn in order to give “ample time for the party to choose a successor”.

Mr Hosie writes: “As you know I have been admitted to hospital on three occasions in the past few years with very high blood pressure. In that regard, the stress of the intense scrutiny of my private life has been very difficult.

“I intend to concentrate on my constituents, my responsibilities at Westminster, and most importantly, my health.”

He adds: “It has been a pleasure to serve under your leadership and I hope to do so for many years to come. I wish you, your Government and our party every success.”

Read more: After the affair ... Sturgeon set for showdown with Hosie in Westminster

Mr Hosie makes no mention of his leading the summer drive to renew his party’s campaign for Scottish independence. It has been suggested that, because of the controversy surrounding his personal life, that he might have to forego this role too.

In a letter of response, Ms Sturgeon thanks Mr Hosie for his service as the party’s deputy since November 2014.

“During your tenure in office, amongst your many other duties, you have authored two successful election manifestos; providing the policy platform for our victories in both the 2015 General Election and the 2016 Scottish Parliament election. These are achievements you should be very proud of.”

Read more: Biography: Stewart Hosie

She continues: “As you step down as depute leader, I know you will continue to make a valuable contribution to the party in many ways and, in particular, through your work in your constituency and as part of the Westminster group.

“I have enjoyed working with you as Depute Leader - and I look forward to continuing to work with you in the future. I wish you well.”