Payment for order flow is not allowed in the UK though that’s a US specific thing.
That’s what I understand. But how will access to MM work? Will there be there no best execution price guarantee?
Im not well versed but I believe the Mifid II legislation forces best deal execution in the UK/Europe.
Edit: a quick Google this seems to explain it well
Yes, MM make their money though the spread, so not NBBO price.