Superb chase game...the cozzers follow your track, overlap to get them to hit eachother.
Keys are 'n' and 'm' as left and right. 570 to beat.
http://www.worldofspectrum.org/infoseekplay.cgi?title=Run+Baby+Run&pub=Firebird+Software+Ltd&year=1983&id=0004269&game=/games/r/RunBabyRun.tap.zip&emu=3&aspect=3