Organised by CAMRA, this festival will see over 55,000 thirsty drinkers through its doors, ready to sup and sample the huge selection of real ale and beers from hundreds of breweries across the UK and beyond.
First held in Alexander Palace in 1977 - or 1975 if counting the unofficial Covent Garden foray - GBBF offers visitors a chance to taste well known, limited edition and new brews.
Anyone who's anyone in this trade and serious about their real ales will be found gracing the floors of Olympia from 11th - 15th of August 2015.
Attending on Friday 14th August, Bobby - another fellow liver pickler - and I held our collective breath as we passed over the threshold and entered the biggest pub in the world, as in previous years it was a beautiful sight to beerhold.
I have to admit that the food again this year was out of this world and absolutely necessary in soaking up all the samples. My favourites were the array of pickled eggs and the hog roast baps on offer - delicious!
So, without further ado, here are our - albeit short - tasting notes from GBBF15....
First up, Fullers Golden Ale - Oliver's Island 3.8%
Delightful! An exciting harmony of citrus, floral hops and golden malt. A choice ale, refreshing and with a very pleasant aftertaste.
Marston Pedigree - New World Pale Ale 3.8%
A lovely hint of peach and apricot lead to a nice hoppy aftertaste. We both agreed that this is a definite session beer.
Sierra Nevada - Torpedo IPA 7.2%
Gorgeous beer! Super hoppy on the palate and a superb aftertaste. Delicious!
Cairngorm - Wildcat Bitter 5.1%
This was a very different beer. Our first impression were that it was a bit too complex, but a second sup and our palates were dancing on bitter hoppy sweet notes. A definite grower.
Harveys - Wild Hop 3.8%
Initially disappointed with this, but after a second and third taste it grows really well to a lovely balanced brew. Another recommendation for a session.
McEwans - IPA 4%
A decent initial taste, but the aftertaste was akin to cheap white chocolate. This maybe someone else's ambrosia, but not for me or Bobby. A gallant attempt but for us - try again.
Gwaun Valley - Blodwen 4.1%
A very good, hearty bitter, a slight hint of caramel on the finish.
Canterbury Brewery - Itzamna 9.6%
This hits everything all at once. Like breakfast, lunch, dinner, tea and supper all in one beer. It's the sipping whiskey of beer! Coffee and chocolate flavours with a slight caramel after hit. Luscious - but you only need a third of a pint.
Greene King Ale - OHA 4.1%
Lovely beer. Lightly hopped via amarillo and citra variety. A very good session beer.
Conniston - K7 4.7%
A decent, golden ale and good all rounder. Light hops, light bitter with a vibrant malty, citrusy aftertaste.
Hawkshead - Cumbrian Five Hop 5.2%
A well hopped golden ale, a lovely blend of English and American hops producing a great malt character and fine session beer.
Bollington - White Nancy 4.1%
A disappointing beer. Promising hops and full bodied taste. There is a hint of citrus but no hop flavour and no aftertaste.
Glamorgan - Welsh Pale Ale 4.1%
Very nice ale, hint of citrus and hops, leaves you wanting more.
Sierra Nevada - Hoptimum 10.4%
This amazing brew is fit to burst with glorious hoppy flavour. It was easily our favourite of the day, absolutely delicious! Alas, it is only served in thirds, although for very good reason.
Brains - Reverend James Gold 4.1%
A lighter take on the classic Reverend James, this golden ale maybe lighter but pulls no punches. A delicious tasting ale.