What sparkplugs are needed or recommended for the Pug 106 1.1 engine, S reg, 1998 car please? Most of the journeys are short 9 miles slow trips to work 3 times a week. Also what size of sparkplug socket is needed. My old one seems to be too big to get in the gap. Also - while we're at it - who designed the bloody air filter caboodle? What a fuss to get the cylindrical air-filter thing out of its pot!