Ah good, a nice paternal and patronising attitude. The issue isn't the parade (always good for the public to see, even if they aren't invited) or even the 10 days worth of practice (which arguably they need), but the heavy-handed attitude that decreed the requirement to live on base and imposed a curfew.
If the curfew was such a good idea, then why has it been lifted?
And I'm sure the good chaps have plenty of time to do their historical studies whilst on their harmony breaking detachments...in fact it is good to see that the historical military spirit of saying 'up yours' to pomposity and petty restrictions lives on!