Speaking to New Model Adviser®, McLean responded to the suggestion that, in buying shares in e-gaming operator GVC Holdings, it had also exposed itself to betting company Ladbrokes Coral, which GVC acquired in March last year.
'We've stepped up over the last year in particular in what we're doing in ESG [environmental, social and governance] investing,' he says in the video, which you can watch above.
'We're focusing on each strand of that. We have signed up to the United Nations' principles for responsible investing as well, which we're implementing, so I think it's fair to say each of our holdings in these areas are under review.
'Some of that is with discussions with the companies and trying to find out how they're managing their impact, while with some of them we will make changes to the portfolio to reflect that.
'It is likely the gaming companies that operate in the UK are going to have to manage their social impacts so there will be pressure on them to take responsibilities themselves for that and to demonstrate it.
'We're in a process of trying to see with GVC what it's going to do about that and whether it can run ahead of public opinion and actually take control of this situation itself.'