Read
http://en.wikipedia.org/wiki/List_of_UK_universities_by_date_of_foundationI think the issue isn't really now long and MBA has been running, but the quality of the students, the experience, the alumni network and so on. Oxford and Cambridge have rather recent MBAs, only 20 years old, but they are excellent. That's why the FT rankings, AMBA accreditation and eduniversal are so great
www.eduniversal-ranking.com/business-school-university-ranking-in-united-kingdom.html .
If you want to work in the UK then take a degree at a school that successfully places international students into jobs in the UK. Use the FT rankings for MBA and Masters in management and add the field called 'international mobility'.
In between the MBA and the MiM degrees are specialist MScs (in finance, marketing, operations etc). These could be a great option. I suggest you look at the business schools that are best for mobility (see
rankings.ft.com/businessschoolrankings/masters-in-management-2013). In London, that's LSE, ESCP Europe, Imperial and Cass. Perhaps these schools have specialist masters, in marketing, innovation etc that work for you?
Henley, Brunel, Kingston, Surrey might be second-tier options, then you're looking at the University of London colleges, which have a great reputation but perhaps weaker careers services: UCL, King's College, Queen Mary, Goldsmiths, Royal Holloway.
PS The MBA in creative industries looks terrible as a route into work, partly because the creative industries are low-wage and precarious at the bottom. There's a lot of freelance work and unpaid internships. If you must take this risky career direction, then go to Central St Martins.