Good review!

I have the Horizon 202, I have never seen the latest model, where did you get from?

Glenferrie is spelt this way, I used to sell newspapers under that station in the late fifties.

I think you may find that the yellow/green filter is quite a good filter. Unless they have changed the filter substantially, yours should be quite good as well. I almost permanently leave my Yellow/Green filter on my 202.