Hi, I have been working in sales during many years now but would like to change the track slightly. I would like to continue my career in marketing. I am considering such roles as sales force trainer, consulting advisor, marketing specialist.
What could be a good option that could facilitate this sort of a career in UK? In the ranking lists on marketing here I have not seen UK's MBAs.
Firstly, I would like to look for top uni's. I am from outside the EU, 42 y.o., I plan to live and work in UK.

I'd suggest you consider a masters in a marketing domain, perhaps with CIM accreditation, if you want to work specifically in marketing. UCD's masters in marketing practice is outstanding if you want to work in consulting, but you ight be too old for them. Cranfield, Lancaster and ESCP Europe have advanced, creative MSc programmes that work across the marketing, strategy and communications fields and would be a good fit for someone with your background. I'd also look at Birmingham and Norwich business schools.

In terms of MBAs, although I am not sure you'd need an MBA for the roles you mention, I'd look at other schools with strong pre-experience marketing MSc programmes http://www.best-masters.co.uk/ranking-master-marketing.html#.VibI1RCrSRs like Warwick, Manchester, Edinburgh since these will have good industry connections and should have stong MBA electives in marketing.

Looks like about 20 % of Warwick MBA grads go into marketing roles:

http://find-mba.com/schools/uk-ireland/england/warwick

That's pretty good. If you pursued a non-MBA master's program and need a post-study work visa, I would be critical about each school's placement rates - you should ask schools about the success rate of non-EU students transitioning to roles in the UK post-graduation.

The ESCP in Marketing & Creativity program is really interesting. Great program.