Thanks everyone for your feedback. I think I'm going to try Topaz this time around as it's easily obtainable.
For the record I'm actually working on a choc lamington ale. Styled like a brown ale (think similar to Quiet Deeds Lamington Ale).
@MHB it appears you are right with alcoholic beverages being exempt from ingredient labeling laws. So there is likely additives.
For anyone interested I've attached an in-development version of the recipe. I might tweak it a bit yet (for example I'm unsure about the caramalt). I haven't ever made a beer this low IBU or used topaz so I might be under / over using. I am a bit dubious of the reported IBU however with the large amount of chocmalt I don't want to over bitter.
Fermentables (6.6 kg)
1.8 kg - Pale Ale Finest Maris Otter 5 EBC (2...
1.5 kg - Munich Malt 39.5 EBC (22.7%)
1.5 kg - Pilsner Malt 3.8 EBC (22.7%)
500 g - Carapils/Carafoam 3.9 EBC (7.6%)
500 g - Wheat Malt 4.8 EBC (7.6%)
350 g - Chocolate Malt 1185 EBC (5.3%)
250 g - Caramalt 36 EBC (3.8%)
200 g - Oats, Flaked 2 EBC (3%)
Hops (155 g)
30 min - 10 g - Topaz - 18.5% (13 IBU)
Hop Stand
15 min hopstand @ 80 °C
15 min 80 °C - 30 g - Topaz - 18.5% (6 IBU)
Dry Hops
4 days - 115 g - Topaz - 18.5%
Miscellaneous
Primary - 350 g - Shredded Coconut
Yeast
1 pkg - White Labs English Ale WLP002
Mash Profile
Low fermentability plus mash out
70 °C - 60 min - Temperature
75 °C - 10 min - Mash Out