As you may know, the Burma Star Association has disbanded although there may be some form of group attempting to retain the name and their history.
Depending on the name of the Regiment, another source of information could be their Regimental Museum or even their Regimental Headquarters, both will also give any advice as to where to go next in your quest - mine does. I do have some information on Regimental Headquarters, but with all the mergers etc of the last 5 years plus, I do not know if any of it is still relevant, but we can always try?