Went for a run along the freeway today and Connie did not want to rev.
Has been fine pottering around town and I couldn't really think what the problem was, anyway, after getting home I cleaned the air filter.
Bingo problem solved!
The book says clean the air filter every 12,000 km, well I reckon that might be alright wherever they wrote the book, but in these parts we have DUST and DIRT.
I guess the upside is that it means the filter is filtering, and not just letting the crud pass through.