hoooorah! car came back from another stint at the garage today and after putting back on the diagnostics it came up with a misfire on cylinder 2. it was tracked down to the new coil pack that turns out to be faulty. weather i was just v unlucky with the one i bought or there is something else knocking the coil out we will have to wait and see.
all the leads and plugs have also been replaced as advised so fingers crossed it will be ok.
Many Thanks to everybody that has posted.