Can anyone confirm if the Pug 306 1.4 1998/S engine has valve clearances
which can be adjusted, and what the syptoms of incorrect clearances
would be?

The engine does appear to idle a little lumpily at times (nothing
serious, but enough to notice if looking for it).  Its done 88k miles.
There's also a strange knocking/rattling sound which comes more apparent
 at certain revs (just under 2k rpm I think).

During the last MOT, the invoice did have "sounds like a hydrolic valve
lifter is playing up - might want to get it looked at" noted under
Customer Comments.  Would this be what they were talking about?

I've looked at the Haynes manual and it seems that adjusting the valve
clearances seems an easy job as nothing major has to be removed to do it
(just the very top cover).

Any thoughts?

Thanks

David