Same here - and I don't think it would be expected. I would normally tip 10% or nearest round figure (even if it's slightly less than 10% - e.g., if the fare came to something like 9.20 it would be a tenner, "keep the change")

Suggestion for Sharon (if it's not too much work) - how about adding notes to list you posted if locals point out inaccuracies?

For example

TD: 15%

could become

TD: 15% (10% according to local FTers)