Thanks Kamold,

will do a bit more forum searching, I took the golf in for it's 120000km service, on a tow truck to VW Barloworld.

They looked at the issue with the loss in power. And as expected, was quite a pricey repair considering. The coil pack on cylinder 4 failed, cost to replace $184. They suggested that the remaining three get replaced as well at a total cost of $590 for all four replaced. I politely declined and had just the one replaced.

Knowing that dealerships are expensive, thought everyone should know what the cost would be for a coil replacement.

Glad it was just a coil and nothing more major!