hi, a bit of updates and additional info.
Firstly to clear up, when purchasing a filter from K&N or Pipercross or any place they are listed as panel filters, but yes it is a cylinder.
I removed the filter and put the orig back in, replaced the maf, 3 times, 1st cheap sh**, 2nd faulty, this one all new and good. i have replaced the throttlebody with a second hand unit from a low mileage car. I have also got replacement cats, all 3 for £110 s/hand inc sensors, (not fitted yet). The car ran well for 3 days i topped up the oil and it now idles at 1200+.
I have ordered a new temp sensor, in case the car thinks it needs to run on choke!!
I have put a flush in and will change the oil.
I have also noticed the brakes aren't too good at the moment, could it be related?
All help welcome. thanks