Though Rock'n'Roll Heaven on Orange Street may not have much stock of interest to Soulies it might still be worth a visit for you Callum.
Knowing your taste, you may still be able to pick up a few nice bits of R&B, Mod Jazz, popcorn etc.
It's over 12 years since I went in the place, and was told not to bother prior to my visit, but picked up lots of lesser known Duke and Peacock stuff with loads of original 'Unicorn' duke sleeves etc.
Not sure how shop is laid out now, but the boxes on display were pretty much full of crap...delve underneath and there were loads of storage boxes full of more oddball stuff.
Then get yerself down to Wet'n'Wild and have a go on that vertical drop slide where you stand in a rocket(?) or summit with your arms crossed and the floor drops away to send you plummeting....yer trunks will be 99% up yer arse by the time you come to a stop!