I sympathise with you entirely, Stuart.
I too have entrusted my local dealer to do the services over the past 4 yrs and ALWAYS check what has been done and have provided all consumables to boot!
I have been disappointed with every service and am on first name terms with most of the staff now! They cringe when they see me........but, like Ruperts T., I decided to play safe and not give Hyundai any 'wriggle room' with warranty and have 'enjoyed' a little goodwill from Hyundai HQ over parking brake failure after the dealer flatly refused to submit to HQ.
And don't forget to ask for compensation after shoddy servicing.....I have enough air/oil filters to last the life of the car! :-)