That's daft! Any other shop you can reserve in person!!
I did what Julie Murphy advised - I brought up the page with Truelove's Gutter and they had a pre-order button - after I went through the laborious process of opening an account I opted for the special delivery - but put a note in the comments box (1) asking for a wristband to be reserved with the album and (2) asking that they NOT post the album but for me to collect in-store and to call me if there were any problems. I haven't had a call so far.
I'm working on the proviso that if the album is only released on Monday they will package them up from that day on (I can't see them working like stink to pack up stuff on a Sunday)- so am bound to get there before it has actually reached the post office - I shall take my email confirmation in with me. (I'm hoping they don't have a central distribution centre, but even if they do I'm sure the staff in Rough Trade East can cancel my order so I can purchase it then and there.)
Just had good news that the rail strike next week is OFF so I should be able to get there for 8am with no problems on Monday!