Update:
I went to
Decathlon and tried the RC520. The 105 groupset/brakes are lovely but the bike did feel too stable. The handlebar features an oval design which seemed indicative of its intended purpose: long, comfortable rides. Huge tyre clearances. It didn't feel sporty enough. Still great value.
I realise Boardman sells through
Tredz.com, which does accept Cyclescheme (Hooray!)
I've ordered a Medium Boardman SLR 8.8 (I'm 5'10, does this sound right?) to
Halfords. My plan is to try to bike there and, if I like it, return the bike and buy it on Tredz.
In the meantime, if any other ideas pop up please let me know. Thank you
@Twilkes for putting me on to this model.
New question: How upgradable is the SLR 8.8? Which bits do you think are worth upgrading?