Nice collection as has already been said there is a lot of DPM but most isn't tropical. No matter it is a good collection. I particularly like the Commando trained mariner from 17 Port & Maritime Regt RLC.
As for talk of a Belize set, only worn in Belize, I am afraid that is simply collectors terminology and completely inaccurate. There are different types of tropical uniform but they only represent different periods of manufacture.
The ones called a Belize set were also worn in Brunei, Hong Kong, Gibraltar, Kenya, Canada as issued items and almost everywhere else by those who had them except NI where they were banned for a time.
They were also standard dress for the SAS prior to and even after the introduction of the CS95 uniform and the Tantalus clothing range.
All together a nice set, but be aware that there is no such thing as a uniform specifically designed for Belize or only worn there. They are just early issued and very popular Trops.