Ticking noise on acceleration

[MarkJ B1]

Anybody have any ideas please?
I've got a 182,well maintained and looked after. During acceleration,either moderate or heavy and at any speed (but more noticeable during motorway speeds) there is a definate noise (ticking/knocking) coming from (I think) the engine bay. I've changed belts twice,plugs,belt tensions,I've had it to Renault 3 times but they jus fob me off,last time I took it in the guy was convinced it was the exhaust so I changed that aswell as all fitting kits and gaskets but still nothing (apart from a hole in my pocket).out of despiration I've also changed up and downstream oxy sensors.
I'm at a total loss.it doesn't actually seem to effect much however there is a definate lack of power of late.
Please any help is much appreciated

 

[Cue]

this may sounds obvious but have you checked the oil?

Ticking could also be timing belt related....

 

[Sam_K]

Yea i was thinking maybe a pulley knackered or something?

 

[MarkJ B1]

Thanks for the thoughts.
I've had all belts changed,the accessory twice (see below).service the oil every 5k.I've looked at the pulleys a couple times and they seem ok but I'm guna check em again.the only thing I can think is when I got the car I had the belts done as a matter of cause ( only 17k at time lol) but sum time ago the accessory came off (bad mechanic fitted it) and it was susequently redone under warrenty.I've checked all pulleys a lot of times since and nothing worthwile.other than this the cars not had any sign of problem.

Any other ideas?

 

[Cue]

could be engine internals then or maybe fan belt?

 

[SharkyUK]

Is it a 'tappity' ticking sound? (Jeez, I sound like Fred Astaire...)