It seems this is more popular in Asia.

http://www.brandsessence.co.uk/en/About-Us/History-Heritage

REGIONAL HISTORICAL TIMELINE

1820 – 1920s

In the early 19th Century, King George IV 's flagging health had inspired the Royal Chef, H.W. Brand,  to create an essence of chicken beverage to boost His Majesty’s physical condition.

After retiring from the Royal kitchen in 1835, Mr. Brand concocted BRAND’S® Essence of Chicken for commercial sale as food for convalescence and invalids. Renowned in the British Empire, BRAND’S® Essence of Chicken found its way to the Far East in 1920s, and had since gained popularity all over Asia.
Sought after for its wholesome goodness, BRAND’S® Essence of Chicken has since sold over 150 million bottles worldwide, which is more than 2650 Olympic sized swimming pools.


Pick and choose where you'd like to buy from. (Probably cheaper and quicker going tpo Win Yip store to buy some.

http://www.brandsessencedirect.co.uk/

http://www.wingyipstore.co.uk/p-7920-brand-essence-of-chicken.aspx
http://www.wingyip.com/Do-business-with-us/Our-Stores

http://www.amazon.co.uk/Brands-Essence-Chicken-Drink-42ml/dp/B0057NEBB4

http://www.amazon.co.uk/Brands-essence-chicken-2x70-cc/dp/B008O7YLT2


Peruse at your own leisure.

https://www.google.com/search?q=BRAND%E2%80%99S%C2%AE+Essence+of+Chicken&ie=utf-8&oe=utf-8&gws_rd=cr&ei=UxoqVcmKMMb1UOPsgZAJ#q=brand%27s+essence+of+chicken+uk


A helping hand.
Take care.