"THE NEW SEASON'S BREWINGS OF
AK and AKK
ARE NOW BEING DELIVERED IN FINE CONDITION.
ROGERS'S AK BITTER ALE,
1s 2d PER GALLON,
AT THE JACOB STREET BREWERY, BRISTOL.
WJ. ROGERS begs to introduce to the notice of his Customers a stronger quality of BITTER ALE, called "AKK," at 1s 4d per Gallon, to meet the requirements of those who may prefer a more invigorating Ale than the "AK," which is a light, wholesome, palatable, tonic Beverage, alike enjoyable by the Family, the Delicate Constitution, or the Invalid, many eminent Medical Men having given it their high approval. It is peculiarly free from the "heady" quality so much complained of in Ales generally, and leaves the Consumer's palate as clean as the finest Wine.
THE JACOB STREET BREWERY. BRISTOL.
Western Daily Press - Saturday 18 January 1868, page 1.
See? AKK was a more invigorating version of AK. I take it that by "invigorating" they really mean "intoxicating". Though they also say that it isn't "heady", a word which I would also have taken to mean "strong". Who complains about Ale being too strong? Certainly not me. At least not usually.
This is the business end of the advertisement:
That's an interesting selection of beers. Mild, Bitter and Stout. Odd that there's no Porter in there. The 1860's is early for a brewery to have dropped Porter. Especially one like Rogers who got into the Porter trade early.
Though it's the most expensive beer in the list, I doubt that the IPA was the strongest. There's a good chance that it was weaker than the XXX Ale. In the 19th century all types of Pale Ale were sold at a premium price and were more expensive than beers of a similar strength in other styles.
There you have it. AKK: a stronger qualityof Bitter Ale.