Hi All
I'm new to the board here so apologies if below has already been covered off....
I use Hillmount Garden Centre in Castlereagh Hills for all things BBQ -
http://www.hillmount.co.uk/ - they have pallets of Weber premium charcoal and premium briquettes. A tad pricier than the norm but the briquettes are just brilliant - if you can no longer source heat beads then go for these - they easily burn for 4 hours on longer cooks and for shorter cooks I close all dampers down and they can be reused which makes a 10Kg bag more cost effective. The Hillmount web site is just ok but I would advise you visit the centre - they have a great selection. They are well into their BBQ there and have a Weber BBQ academy located onsite
Makro also sell restaurant grade charcoal (Fuel Express) in bulk 12Kg bags.
http://www.makro.co.uk/M093383.htmlI haven't tried it though