This has been a fascinating thread with lots of interesting information - thank you to those who have provided some historical background, even if the OP isn't overly keen on listening/taking the advice contained therein!
Visiting is, of course, very different to living in the area, but the A10/Great Cambridge Road between Enfield and Waltham Cross-ish has a lot of personal interest for me, being a "road well travelled" between the M25 and my grandmother's house in Bush Hill Park - even before I could claim to be an enthusiast, there was something notable about the "non-Red" buses on the 310 compared to those on the 217 and 231.
I think, with the greatest of respect,
@aron2smith has also fallen into the trap of thinking "I want to go there, so everybody else must want to go there too, and I don't understand why there isn't a bus that fits". We've all done it - I probably still do in my own area - but there really doesn't seem to be a lot of call for those travelling northwards out of Enfield. I really can't see what Brookfield has to offer than Enfield Town or Waltham Cross already do, for example - or even Southbury Road retail park. My grandmother had friends in Cheshunt, and as she didn't drive her journey was walk-train-collect by car, whilst her friends would just drive. They only ever made the journey to visit each other, and not for any other sort of leisure purposes - there simply wasn't a need to "let's go shopping in Enfield today", for example.
There was a service from the end of my Grandmother's road that would have taken her to Waltham Cross or Upshire for a period in the 1990s, the 517. Whilst she made occasional use of it to Enfield Town (rather than the 192, slightly further away, or the train, slightly further still), I don't recall her ever saying she went to Waltham Cross (e.g.
https://www.timetablegraveyard.co.uk/Scanned_Counties/500to699/517-WalthamX_19940326.pdf; later
https://www.timetablegraveyard.co.uk/Scanned_Counties/500to699/517-WalthamX_19960504.pdf - replaced by 377 in 2001).
I'd also mention the 310B, Saturday shopping service to Harlow, here (presumably for a market).
https://www.timetablegraveyard.co.u...310A-WalthamX_310B-WalthamX_20011020_4165.pdf, later combined TT
https://www.timetablegraveyard.co.u...thamX_310A-WalthamX_311-WalthamX_20000923.pdf.
My collection of Hertfordshire timetables is quite sparse - unlike Surrey, Herts seemed to favour using the same covers on their books, and I've never got around to listing those I have, as well as being twice the size!), but I have looked back over those from 1992 (Leaside), 1995 (Herts Eastern) and 2006 (Area 6). Fundamentally, the level of service provided is much the same - the only real difference in roads serviced in the Cheshunt/Waltham Cross areas comes in the C-series services in 2006 (which I recall were alluded to above, likely by either
@Dwarfer1979 or
@greenline712), including the station service as mentioned. Frequencies are also really rather similar, and the only other major change is the truncating of the 310 (but more than covered by the increase in 217/231). That would suggest that the level of service is considered "about right" - and in a highly conservative (30/35 seats on Broxbourne Borough Council) and likely high car-ownership area, there simply isn't the will to provide more services carrying "fresh air and the driver".
Other grandmother lived in Potters Bar - very definitely in a Haringey Council owned house, much like "overspill" housing built in Cheshunt (despite her house being in the corner, furthest away and least noticeable from the grass area, it was her house they decided to screw a bright yellow 'No Ball Games' sign to). After 40+ years, I think she had long lost any sense of being a "Londoner", and I would suspect much was true of her neighbours, and those who have lived in Cheshunt a long time. I doubt my parents would either, nearly 40 years after they moved out of the same area. The only bus route there was the local PB1, but I don't seem to recall much discussion about elsewhere. Probably to Barnet, as that was where the hospital was - certainly no discussion of Hatfield.
I'd encourage
@aron2smith to check some other resources, too - the excellent londonbuses.co.uk site shows not only that the "red" services did not cease at deregulation, but also that they were highly changeable over a period of years - also, neither the 259 or 279 served Enfield town, just Waltham Cross and Edmonton! I've certainly picked up a fair amount more about services in that area as a result.
One final point I'd counter: I believe there was a suggestion earlier that the Waltham Abbey area was the area that had suffered most from cross-boundary links being lost. I'd also suggest the south-east London/Kent boundary, i.e. those areas that used to be Kent but now aren't. If anything, having looked at a variety of old maps currently hanging around in the sales stock of my local enthusiast Club from the late 60's/early 70s, I'd suggest that 'red' buses extended unusually far north here compared to the country counterparts.