There is no such thing as Ordinary Bitter, I should know I’ve been drinking Bitter for 56 years. Make a Best Bitter at around 4% as Lumpher says.
I do not have your experience in any way, but I do have to disagree. Yes, the BJCP gets a lot wrong. But personally I am not a fan of dogmatic approaches in general. And I have seen the term "Ordinary" among many English sources. Ron Pattinson, for one:
Let's Brew: 1970's Youngs Ordinary Bitter
One step up from Light Ale was one of Young’s biggest sellers: Pale Ale or Ordinary Bitter as it was called down the pub.
Ultimately is the word "ordinary" a deal breaker? "Best Bitter" is also there, and many breweries do use the term. And from reading Graham Wheeler and others, there are plenty of British bitters in the 3.* range. And a look at Wikipedia:
Session or ordinary bitterStrength up to 4.1% abv. This is the most common strength of bitter sold in British pubs. It accounted for 16.9% of pub sales in 2003.
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Before we hammer the source, the source they cite is: Statistical Handbook / A Compilation of Drinks Industry Statistics. British Beer and Pub Association: 21. 2003. So I don't know. I'm not too concerned about the word "ordinary" personally.
This is just from Graham Wheeler's Brew Your Own British Real Ale:
Adnams Southwold Bitter - 3.7%
Boddington's - 3.6%
Brakspear Bitter - 3.7%
Bunce's Benchmark - 3.6%
Cameron's Traditional Bitter - 3.7%
Chester's Best Bitter - 3.7% (something I often find interesting - what a given brewery may call its "best" bitter is down in the lower ABV range)
Coniston's Bluebird Bitter - 3.6%
Everard's Beacon Bitter - 3.8%
Hook Norton Best Bitter - 3.7% (ditto to Chester's "best")
Marston's Burton Best Bitter - 3.7% (again)
Sam Smith's Old Brewery Bitter - 3.8%
Shepherd Neame Masterbrew Best Bitter - 3.7% (again)
Smiles Brewery Bitter - 3.8%
Tetley Bitter - 3.6%
Timothy Taylor Best Bitter - 3.8%
Tolly Cobold Bitter - 3.6%
Too many to list, but if you look through Roger Protz's Real Ale Almanac, there are tons in the 3.* range there. Theakston Best, Vaux's Lorimer's Best and Vaux Best, Bass's Light 5 Star, Special Bitter and Piston Bitter, Clark's HB, Garthwaite and Traditional, Franklin's Linfit Bitter - all 3's abv. The book's not even out of NE England and Yorkshire yet.
My point being I think the 3-something abv bitter is definitely there and very much worthy of attentin. I do think it's one of the harder things to pull off well, which goes to my general philosophy (former French chef), that the hardest thing to pull off on a plate is to rely on total simplicity - wizardry on a plate may impress, but it takes mastery to strip things down and trust. Matt Brynildsen of Goose Island (now Firestone-Walker head brewing honcho), with whom I worked, said exactly this to me one day (brewing low gravity, simple malt and hop bill beers) and the notion stuck from that point forward.
I will never forget my first taste of Bluebird and it has been a kind of background mission ever since.