I think it's worth making two points here. Firstly, the reputation of the university tends to be far more important than the grade you receive as long as you get a 2.1 or above. This is because often firms filter by university rather than grade so for example a 2.1 for Warwick in economics would get you into more places than say getting 80% from Swansea, this is all about getting you into the interview because once you're there it's not about uni and more about how good the individual is.
Secondly, with A*AB why don't you apply to some of the better unis given how important the uni's relative prestige is in the application process? With those grades I'm sure you could get offers from universities far better than the one's you've listed and that are semi-targets at least. It might be a stretch to get into the Warwick and UCL's of the world with those grades but I'm sure you could get into places like Nottingham, Durham, Bristol, Exeter, Edinburgh for example which would be more likely to land you with a MC interview than any you listed. The one's you've listed, I think most would agree that it would be very hard to get into to MBB or mid-tier, although you might through the really big schemes like big4 consulting, Accenture etc.
As a disclaimer I interned at a boutique consulting firm specialising in the TMT sector over the summer and there wasn't anyone who went to the unis listed. Mainly Oxbridge with some others like the semi-targets I listed. Only exception was one of the MD's went to the university of Stirling but he was the only one. Not saying all consulting firms are like that though, just sharing my experience.