What is an LHC horse?

I might be wrong here, but according to what I find in my research (and I'm not a horse person), is that LHC is an acronym for Life Height Certificate, which is given out by the JMB (Joint Measurement Board, Ltd).

This is done in the UK.

According to the JMB website, the purpose for measurements is:

1. Purpose

The Joint Measurement Board was established in 1934 to run a national scheme for the measurement of the height of horses and ponies for the purpose of description and classification of horses and ponies for competition.