Looking at around 170 ish quid for the parts to do this job, nowhere near 450.
If youre even a little handy with the spanners, just familiarise yourself with the engine setup in one of the haynes manuals for your car and have a crack at it yourself.
In order to change the tappets, the cam has to be removed, which means the belt needs to come off, the cam cover obviously and the cam caps.
Shouldnt really take more than a couple of hours to do it even if dragging your feet.
Cam if worn would need replacing but only if its worn and they generally last a heck of a long time.
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