For some further reading, I'd suggest the following: -
https://www.fireandfury.com/orbats/modcwbritish.pdf
And (starting on page 52): -
http://suptg.thisisnotatrueending.co...7961481421.pdf
Much of that is going to be the same as that posted by Rainbow Six but sometimes one OrBat has details that another OrBat doesn't so it's useful to compare the two to get a fuller picture. For instance, the first link I posted mentions, under the section for HQ Northern Ireland, that the province of Northern Ireland provided reinforcement units for BAOR.