Darker invert sugars thin out a beer a little, but not as much as one would think, also leaves a nice toffee/butterscotch-ish flavour that you can't really get any other way. Can replace crystal completely if used at around 10% in a bitter.
Amber or brown malt ( the real deal sourced from UK) can definitely be used in a bitter in small amounts for a little depth.
Yeast wise any English strain would work, Verdant, lallemand esb, Windsor etc if you prefer dry. Don't ferment cold to try to subdue all the ester character as some USians tend to do, kinda defeats the purpose of using an English strain.
Amber or brown malt ( the real deal sourced from UK) can definitely be used in a bitter in small amounts for a little depth.
Yeast wise any English strain would work, Verdant, lallemand esb, Windsor etc if you prefer dry. Don't ferment cold to try to subdue all the ester character as some USians tend to do, kinda defeats the purpose of using an English strain.