Looks great and sounds great. I reckon the change of yeast has altered the grassy/chalky thing. American brewers use US05 to reduce interference with the powerful hops. English beers traditionally derive much more flavour from malts and yeast. And get lots of flavour from them, even in low gravity beers with very few ingredients. Bodds was a great example in its heyday.
You're probably right about the yeast. The taste isn't gone completely but it's much less noticeable than my LP and hbc English pale. Hopefully water treatment will solve it but for now I'm very pleased with this. I should have put it out the shed last night so I could enjoy a nice cool pint of it this evening. It's been a shocker of a day at work and several pints of something not too debilitating would have been perfect. I've got some bottles of craft IPAs to get through instead that someone gave me as a swap for some shoes. Long story.