Maguire IIRC (and I might not) - on the ReadingFC Football Fancast they had a long old interview with Ady Williams. He was talking about Webb and he said he [Williams] had turned out for a reserve match at Macclesfield or somewhere equally godforesaken and he was stunned to see Howard Webb there. Ady asked him what he was doing and he said "refereeing" - not that big time if he was still turning out for stuff like that.
At the risk of getting the usual ire, Dermot Gallagher was known to ref JCR matches