Self-confessed 'middle-aged fogey' Hugh Berger, chairman of the Building Preservation Trust, was so impressed by a building he saw last week that he rushed to phone the aj. 'I spend most of my time opposing developments,' he admitted. 'But this is quite extraordinary, a most exceptional building.' The object of his admiration? The new Oxford services complex on the M40, by architect J Ward Associates of Market Harborough. 'It's so well detailed,' Berger enthused. 'Even the locks in the lavatories echo the shape of the roof.'