As it happens my last-but-one beer had some Flyer in it, a left-over I needed to use up. Flyer are one of those hops that got as far as being named but then from what I can tell the agronomics didn't really work out, so 2018 is about the last ones you'll see commercially. They were intended as a high-alpha hop, but have that kind of resinous treacle-toffee flavour that you also get with Phoenix a bit, but there otherwise there isn't really a close match from a flavour POV. Great hop for dark beers, but it looks like it's now on the "historical interest only" list. About the only place that still grows them AFAIAA is Bushel of Hops, but Dorothy hasn't been selling hops these last two years for family reasons.
https://abushelofhops.co.uk/product/flyer-100g/
If you can find Phoenix I'd use that - and you can argue that a hop bred 20 years ago is hardly "traditional" in a RIS, but it is nice so I might be tempted to just up the late additions by 50% (or maybe a bit more, whatever fits the packet size available) - I assume you're getting a discount for that age?
Otherwise, maybe something like a 2:1 mix of Goldings and Bramling Cross - not the same, but a nice combo in dark beer.
Not sure if this was to me, but thanks for the Phoenix recommendation. I think it was from an earlier post or more by yourself that I got the Flyer info and I think I do recall your mentioning something of the similarities and subtle differences between the Flyer and Phoenix.
The Flyer isn't coming at a discount - $11 US v. $12 US for their other hops. They do carry Phoenix and I'll go with that.
On EKG and Bramling Cross, per posts by you and perhaps Cire, trying out 50 L of best with:
Grain/Extract/Sugar
% Amount Name Origin Potential EBC
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80.7 6.40 kg. Golden Promise Great Britain 1.037 5
9.1 0.73 kg. Invert Sugar No.2 1.045 65
5.2 0.41 kg. Torrefied Wheat Great Britain 1.036 5
3.5 0.27 kg. Crystal 55L - Hugh Baird's Great Britian 1.034 145
1.5 0.12 kg. Crystal 120L Great Britain 1.033 317
Potential represented as SG per pound per gallon.
Hops
Amount Name Form Alpha IBU Boil Time
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40.00 g. Goldings - E.K. Pellet 8.10 23.8 90 min.
84.00 g. Goldings - E.K. Pellet 8.10 9.1 10 min.
110.00 g. Bramling Cross Pellet 5.10 6.2 5 min.
28.00 g. Goldings - E.K. Pellet 8.10 0.0 Dry Hop
28.00 g. Bramling Cross Pellet 5.10 0.0 Dry Hop
-not sure if the dry hop is indicated or not.
A strong bitter will get Challenger (bittering, 90 min.), Northdown (20 minutes) and a favorite, First Gold, at 10 min., WP and dry.
-one question I do have on the GP: I recall Cire indicating he feels GP can easily get overwhelmed by a lot of crystal, in particular dark crystal. I'm reminded of older comments you made re: Warminster in the same vein - let it shine, without too much else to overwhelm it. (In fact relative to the best, above, likely eliminating the 120 crystal and pulling the 55 L down to 3.5%; adding 30K Brupak to deepen the color). Would you think a crystal at 5% would impact the GP significantly?