Honda sent me a letter in early 2005 to tell me that my 53-reg Jaz would from now on need it's valve clearance checked every 25k irrespective of age (until then Honda policy was to check clearance at the 2nd, 4th, etc, service and *not* on miles), to bring it in line with the 2004 & 2005 models thanks to improvements in servicing procedures.
Honda suggest the valve clearance check is to ensure the best performance and economy and was due to the compact design of the engine.
2006-on cars don't need it checked until 62k miles.
Personally myself, if my Jazz was due for a service but just short of 25k miles, I would have the valve clearance checked then - if of course you prefer to have it checked! I see no point in having the car serviced only to bring it in a couple of months later for a valve check!