@doylebros I tried TPS but they seem quite expensive, to give an ideal, I enquired about air and oil filter, oil and spark plugs and they gave me a total of £130!
@Peskyjones Yeah mate, I've been following your thread, such a shame but glad you got it resolved in the end. How can I go about checking if this is the issue ? All my research points towards this issue, i.e. fine on cold idle, as soon as it warms up, it starts to sound like a diesel.