Pleased, and not surprised, to see you liked the car Geoff. Similar thing happened to me, except I changed from a diesel. My 'test drive' was as a courtesy car for 8 hours (not all spent driving of course) whilst mine in for service and I just had to have one. Numbers didn't stack up initially - and still don't really - but glad I made the change as it is a much more refined car in terms of space, layout and feel. As recorded elsewhere, some things could be improved but DJP has put it more eloquently than I would when comparing interior to competitors.
The indicators will take some getting used to but aren't most cars built that way now?
In terms of numbers stacking up, tax saving is great - even better if you do low mileage - and I would advise a real world fuel cost based on low 40s. That is my average for mixed motoring and around 10 to 15% better than the diesel. Long A road runs at steady 40 should return over 50.
By the way, performance and noise levels perfectly acceptable for me and my passengers.