I have replaced the rocker cover gasket. But now notice have small oil leak which appears to be coming fro under the "distributor" unit on the rhs of the top of the engine. 1.2 8v version. Any idea what this is?

take coil packs off (the allot bit) there is a 50p O ring in there 10 minuet job

that's great Dave..will do...thanks for quick reply too