Jeremy Corbyn has told Labour MPs that next year’s Scottish Parliament elections are one of his top priorities as leader.

Addressing Labour MPs for the first time since his resounding victory on Saturday he also outlined plans to spend a day a month in Scotland.

He will be joined on the visits north of the Border by his newly elected deputy Tom Watson.

Mr Corbyn's other main aims included to win the 2020 General Election and to campaign on housing, he said.

But the leader of one of the UK’s biggest unions has questioned if Mr Corbyn’s brand of anti-austerity left-wing politics will appeal to ordinary voters.

Sir Paul Kenny, the general secretary of the GMB union, said that the jury was still out on Mr Corbyn's leadership.

"I really don’t know if Jeremy intends to lead (the party) into the next election," he said.

"What I would like to think is that the Labour party will win back those millions of people it lost, and to that degree it has to have a different message.

"Whether Jeremy is the right person to deliver that or not, I don’t know. We’ll have to wait and see."

He added that while the response to Mr Corbyn's appearances at election rallies had been "enthusiastic" he questioned whether or not "the support was, at this stage, enough for me to say 'I think wherever we go in the country people will flock to Labour'.

"Let’s see how the public react. And let’s see, effectively, when the tests come, whether they are by-elections or local government elections or indeed the election of mayor of London next year, let’s see what the voters say.

"Because at the end of the day they’re the important ones".

The SNP also hit back at the Holyrood campaign plan.

Western Isles SNP MP Angus MacNeil said: "It's clear that Scottish Labour is a branch office again and (Scottish leader) Kezia Dugdale will be campaigning from the sidelines."

His comments came as controversy grew about Mr Corbyn’s choice of shadow chancellor.

Veteran left-winger John McDonnell has said that he is in favour of nationalising banks.

Supporters say that Mr Corbyn's attacks on the Conservative party's austerity policies hit home with voters during the Labour leadership contest.

But there was a lukewarm reception to Mr McDonnell's appointment from business.

The director general of the Institute of Directors (IoD) Simon Walker warned that some of Mr McDonnell's policies would "undermine our open and competitive economy".

The CBI did not issue the traditional statement welcoming the move and instead said that it "congratulated" Mr McDonnell on his new job.

Mr Corbyn did manage to reassure his own colleagues over a key issue, however, rejecting suggestions that he would back mass de-selections of MPs.

A number of Labour MPs fear that some within the hard-left of the party will now push to replace politicians with more moderate views.

But Mr Corbyn said that he saw no need to change the party selection of candidates.

He also pledged to fight David Cameron's planned shake up of Westminster seat boundaries - which many Labour MPs fear will lead to difficult, and potentially divisive, fights over newly created constituencies.

There was silence as Mr Corbyn arrived to address Labour MPs.

The serial rebel, who has voted against his own party more than 500 times, has not been a regular at the party's weekly meeting.

But there were cheers when Mr Corbyn spoke as he told MPs that 28,000 new members had joined Labour since Saturday afternoon.

A Labour source added that the new leader was "genuinely excited about the possibilities that he sees in Scotland”.

But the SNP called on him to set out exactly where he stands on the European Union. following comments from former Labour frontbencher Chuka Umunna.

Mr Umunna said he had key points of difference with his new leader "not least on the European referendum".

Labour aides pointed to a statement over the summe in which Mr Corbyn said that while Labour should set out its own clear position to influence negotiations with the EU and "we cannot be content with the state of the EU as it stands.. But that does not mean walking away, but staying to fight together for a better Europe.”

Last night Western Isles SNP MP Angus MacNeil said: "It's clear that Scottish Labour is a branch office again and Kezia Dugdale will be campaigning from the sidelines."