The Stout of the century

Continuing my occasional series of Barclay Perkins Russian Stout adverts, here's one from just before WW I:

Here's the text:

"The STOUT of the CENTURY
NOTICE - To those who want the best and can afford the price BARCLAY, PERKINS & CO. have now made arrangements for their

IMPERIAL RUSSIAN STOUT

as brewed for the last 100 YEARS to be obtained from the Brewery in cases of three dozen, or name of Local Agent will be sent on application. PRICE 7/- PER DOZEN (Imperial Pints.) This Stout can be "laid down" and will keep for years.

BARCLAY, PERKINS & CO., THE BREWERY, SOUTHWARK, S.E."
Globe - Monday 02 November 1908, page 4.

7d an Imperial pint was very expensive for 1908. A pint of standard draught Mild would only have set you back 2d a pint. And you were only getting that price if you bought thee dozen bottles. Which is quite a lot of such a strong beer. Though I'm pretty sure I could have got through them.

An Imperial pint of a beer over 10% ABV. What would the Portman Group say?