Keith, if you contact Apisuc direct they will probably direct you to James Flint (Gemini Foods) who in turn will direct you to James A Finlay Ltd, 29 Maghaberry Road, Moira, Craigavon BT67 0JF (028 92611300) who are their distributors in NI.
Myself and another beekeeper liaised with James Flint and Jim Finlay to have syrup and fondant brought in during 2012 and a lot of NI beekeepers have benefitted (I think fondant was just over £13 for 12.5 kg and syrup was a bit over £11 initially - these prices did go up by the end of 2012).
I made enquiry about buying a couple of bulk containers this year (2013) but the charge/deposit for the cubitainer was too much. For the time being it is more cost effective for me to buy the 14kg containers of syrup.