If it don't throw a CEL light, and you don't have induction kit fitted along with other mods and still running a standard ECU. I would say don't bother, as the ECU will pull timing and adjust fuel/air to a degree to compensate. But that's just me and all cars/models are slightly different and some more tolerant to small mods than others.
That said for the extra few ponies/spool/ and agro of decat and recat for MOT, and risk of getting pulled by Plod/Vosa I wouldn't bother with a decat at all any more.
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