Way back when, in ADSLx days, Zen was primarily a business ISP, as IDNet was. Both only had BT Wholesale available.
In those days there was nothing approaching today's 24/7 online business internet use. Amazon itself only came into existence in 1994, as just a bookseller. It didn't start trading as that until July 1995, and didn't make a profit until a tiny one in the last quarter of 2001.
The rest is history.
My point here is that the
business use that was Zen and IDNet's bread and butter was internal communications by biggish businesses and B2B trade. Mostly shutting down in the UK at 17:30 or so and not starting till 8am or later. Relatively little happening over the weekends too.
Because considerable bandwidth was needed during the day for this business stuff Zen and IDNet were paying a huge amount to BTW to have it sitting idle overnight and at weekends. Getting into the consumer market was the obvious way to get our money, at virtually no cost to them.
(With little on no night-time telephone or online support. To this day I don't think IDNet offer 24-hour or weekend consumer support. At least if they do I think it's only on social media. Zen I don't know).
The capacity available to a smallish consumer base was large, as their high pricing compared to the mass market deterred most people. Result - excellent speeds, latency and throughput. With the day-time support being highly trained and competent, as demanded by business users.
That
business model has of course become non-viable these days. Their past reputation was justly earned,
but the business and consumer markets are now much more savvy and demanding 24/7/365, with the consumer broadband market provision by BT/Plusnet/EE, Sky, TalkTalk and their various vISPs of generally high technical quality and reliability.
Support by real people generally for the consumer market these days I know little about as I rarely needed it and am now completely out of the landline-based market. But from what I experienced in my last few years with Plusnet then even AAISP before dropping the landline, and see on these forums, it is highly variable, with Zen and IDNet being two relative minnows in the consumer market beginning to struggle with staff costs to maintain their support and even broadband service levels.
Connections: OnePlus 8 Pro on Three 4+ (LTE)/5G and at home Three Mobile, with (Three)ZTE MF286D router giving about 113/20Mbps.
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The price of liberty, and even of common humanity, is eternal vigilance. (Aldous Huxley version of the well-known saying)
Were there none who were discontented with what they have, the world would never reach anything better. Florence Nightingale (Cassandra: an Essay (1860 edition?)