They look a bit on the worn side to me but may just be the picture. Take the cam out and have a look at the lobes. If the tappets have gone there is a good chance the cam has aswell. Go and buy a new camshaft and tappet set from a motorfactors. A new standard cam kit cost me £95 nc vat. Hold a ruller or a straight piece of metal across the tappets and you will see if they are worn. Also check that the button on top of the tappet dosent compress.