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Lovely bike, from a fellow Rourke owner!
+1 for the FSA adaptor. Needs special loctite (that comes with the kit). Brilliant and simple and not a creak out of my Spesh since installing it.
By contrast I had nightmares with the Token adaptor that came installed on a Genesis Volare 953 frame I bought. The bearing cups were 1. too small by about 0.4mm and 2. out of round by about 0.3mm. Putting a crank with new bearings in made for instant gritty tight horrors. I spent hours very carefully filing and measuring the inside of the cups until they were 0.05 smaller than the OD of the bearing and perfectly round, and since then has been perfect.
The FSA threaded adapters are good and they're fifteen quid. You need to press them in and secure with bearing retainer compound. After that, you can fit whatever threaded BB you like. Certainly cheaper and less creaky than a Praxis.