None of these has any of the 'triple crown' accreditations do I don't think there is a big difference. London Met probably has the worst reputation and Plymouth is closer to average.

Thanks Duncan
How could I compare Northampton to Plymouth while they have about 2K£ difference in fees?

Maybe consider this https://www.thecompleteuniversityguide.co.uk/league-tables/rankings?s=Business%20%26%20Management%20Studies

Duncan, Thank you for your advice. I have seen the BTEC postgraduate diploma in strategic management and leadership provided by UK providers. Does this work as an equivalent for the graduate diploma in management offered by the UoL?

[Edited by tokugawa on Mar 26, 2018]

tokugawa, we gave you many replies in your own thread:
https://find-mba.com/board/distance-learning/are-there-any-european-equivalents-to-the-graduate-diploma-in-management-of-lse-52986

[Edited by George Patsoulis on Mar 26, 2018]