LOL!
Sorry, not directed at you, but anyone saying a Honda sounds "cammy"
Ok! Let me pre-apologize. You are in the UK, where hoods are bonnets, trunks are boots and cars run on petrol, so before I make anymore of an ass of myself I should note that the term "cammy" may very well mean something entirely different in your neck of the woods, But
in the United States "cammy" is a slang term to describe the exhaust note of a single cam, pushrod carburated engine with a camshaft selected to run at high (relatively) RPM. (its a hotrod, muscle car, perf truck term, etc... old tech )
A cam for a motor of the previously described vintage can only be optimized for a relatively narrow operating range. So if said cam were intended to run at high RPMs (say, wide open down a drag strig), it would function rather poorly at low RPMs, (like tootling around town). It would allow for decent airflow at high RPM at the expense of choking the engine at low RPM, you see?
Thus, if the wide-tired, candy flamed 65 GTO next to you at the stop light was coughly along with a deep, throaty "Blump Bahlump lump", with the owner goosing the throttle occasionally to keep it from shutting off, you (as a fellow hotrod enthusiast), would whistle appreciatively and say "Listen at her cammin'!"
Thus, my amusement, by American standards stock, electronically fuel injected vehicals, (espeically ones as finely tuned as Hondas), don't sound "cammy"... but if it means something different over there, I apologize to your mechanic.
And as for the..... describe the sound please? Is it like a constant click or rattle?