looking around ARRSE and on the Household Cavalry website there seems, to me at least, to be a contradictions...
when you join the household cavalry can you only do either a) ceremonial duties and b) operational or is it more like the Foot Guards who do both ?
You can do both, but you start with either one or the other and transfer after a couple of years. You might start on ceremonial for a year or two, move the the armoured side for a few and then find yourself back on ceremonial on a promotion for another couple of years.
It is possbile to stay at ceremonial duties at the Household Cavalry Mounted Regiment. You would need to be selected for one of the permanent cadre positions at HCMR - riding staff, the forge, the tailors or the saddler's shop.