Why not drop him a fax tomorrow morning referring to the matter and mentioning 'that whilst you required him to act on your behalf concerning the matter, it appears that the matters have gone unabated. We therefore would be obliged if you could disregard our instructions with immediate effect. Whilst we are unaware of any works done in this regard, please forward a detailed fee note by return which will be investigated without any unforeseen delay. Yours etc' or similar