Ive looked around at what everyone says and the concensus is that they do on the whole eat oil (some dont) also the oil recommended is thin and so I guess burns off quickly,its nothing to worry about and just keep checking the oil once a week/fortnight.
Caining it in Vtec for large portions of time will also use up oil.
Thank you. It's going in for a service this week so hopefully a oil change will do it some good. It's on 192,000 so still going very strong.