It seems they are, as i’ve measured and re-measured the bearing seats and internal diameters to get what i needed, Here’s an answer from the staff on the Evans website: “Yes, it’s a 1 ½ bottom and 1 1/8 top, 45 degree integrated bearings. 42/52mm bearing external diameter with 28.6/40mm internal diameter. 46mm / 56mm head tube external diameter”
That’s right,the hope adapter is best, I got an integrated (def no cups, just bearings that sit in the frame) M:part Elite tapered headset from evans (about £30) – the joy of not having to fit a headset! A standard 1:1/8th fork gives plenty of options, like the Salsa Vaya fork or On-one/Planet-X offerings. There’s also the option of finding a full carbon tapered steerer fork if you have the budget (Kinesis CXD or a chinese job from Ali express for £110 if you’re brave), but they don’t have rack mounts and may not be tough enough. Also worth seeing what ebay brings up, I got my BB5 road calipers and fork very cheaply..