Thank you for your reply. It’s a difficult one. I’ve since had a test drive in two other Golf 1.5 TSI 150’s and both have similar characteristics to the problem I’m having. It looks like there is a fundamental problem with this engine when matched to the manual gearbox which VW have not totally resolved despite making claims they have over the years by releasing various engine management software updates.
I’ve arranged a service appointment with the local VW Dealership early next week so hopefully they can come up with a solution. It’s a shame because I really do like the car and this issue is spoiling my enjoyment of it. It’s an approved used VW car which comes with the 30 day no quibble exchange guarantee. Hopefully a solution can be found and I won’t need to rely on this.