wim. do you sell tyres as well? 
Yes they do (under the guise of sister company Blackboots). I'm not sure WIM look at KwikFit as a competitor - the sort of people generally who use Kwikfit do so due to it being local and a 'known' brand (hence unlikely to rip off - yeah, right!). There is not, as far as I can remember, one in Chesham - nearest I can think of is Berko, Hemel or Wycombe.
It may sound like a cliche, or that I am an employee/shareholder/commission/related (I'm not), but WIM do offer a different level of service to most other fastfit places I have used. Every time I have been, I have been delighted with the service, not just to my car, but also to me (shame the free tea and coffee has gone

). Very different to the service I received at places such as KF/ATF/STS/Just Tyres/independents. Its not like its simply 'round the corner' for me, but I do continue to use them until I start receiving poor service (to the car).
I reserve judgement on how the other/franchised/expanded WIM centres will work, as they are existing tyre centres, possibly with the 'fastfit mentality'. I have discussed these concerns with wheels-inmotion, I like what I hear back, but reserve judgement until we know how well it works in practice. It seems wheels-inmotion is prepared to dump centres that are not up to scratch.
Back to KF - I suspect BBC, as is the new style, only mentioned/reported on the bad ones, and the good cars they put in were probably not mentioned at all.
Additionally, any large company will have good eggs and bad apples, be it Vauxhall dealer networks, fastfit, police, tinpot yankee computer firms...
When Mrs TB used to work for Ford, our company car had to have tyres/exhausts (at less than 2yrs old!!!) down at KF, as Ford was a part owner. The local KF centre in Banbury knew this was a money spinner, and would quote for the most expense tyres, and do the routine about shocks (we only had car for 2yrs

) and brakes. We always refused the Michelin tyres, and said we would get shocks/brakes done at dealer who'd used genuine parts (who said nought wrong).
I did hear from an ex-employee that they had a target (in the 1990s) of £40 per customer, if one customer just had a single cheap tyre, the next had to have extra work.
But the local ATS in Brackley seem to be more honest. It seems to have an older workforce rather than kids. Likewise with the ATS in Bletchley. Though other centres have not been so great.
Specifically for KF, I would imagine we all know somebody who has been poorly treated by a KF centre, yet they are always busy :-/