This is why I wouldn't buy a bike from Halfords. Whilst they can get away with it, they will do. If they think that they are losing business to other makes because buyers can get test rides, that might start to change their approach.P.S. I would not buy a bike without at least a 10 minute test ride. You really can't judge fit and handling in less.
Until then, if you like the Boardman, you should try a Spesh Sirrus. In fact, you can try a Spesh Sirrus, even up a hill, and then you can tell Halfords why you didn't buy their Boardman.