Many thanks Mike, will make sure I keep a close eye on the oil level and top up when it drops.your totally welcome for any help given form me,, those pumps do fail and when do they take the engine out have seen it many times before like said before and with mileage its like the timing chain its a must do job before it fails as when they do its expensive, not hard to replace just pull the intake pipe away and have 2 bolts 8mm on some cars and 10mm on others,, use a socket on them is a must have tools , then use a screw driver to lever it away from the head,,, when installing the new pump clean area off,, you can put a light coat of sealant on the rubber 0-ring only but not to much as have seen people use to much and block the oil feed hole further in side the pump,,,
as for driving on with a oil leak depends on how far and long ie those engines must keep oil level around the full mark all the time, as oil dont just lubricate it ,, it also cools the bearings as well so low oil level damages engines big time,
i got a oil leak on my vauxhall at present cant find time to sort it at mo been like it for 4 months I stick litre in every 2 weeks a mo its fine but never let oil get low,
Hopefully that pump arrives soon, I just received a notification from the vendor saying there will be delays in delivering the part due to changes at customs with Brexit. Looks like the part is actually coming from Germany.