Right, tell you how I got on. I emailed 4 sellers on GEMM, who had listed the right cat#, asking if they could give me the barcode on the cover. One came back with an out of stock, two had no barcode on the cover. But one came back with

"hi the klf 12" has the following number under the barcode 5 017139 200084 all the best from Mr X, X Records", so I asked what price he'd do it bypassing GEMM's surcharge (sorry Butty but had to be done), and he came back with a price of....£26 including p+p. Pretty good eh. I haven't actually got the record yet, hence the Mr X, X Records bit, but it's no longer listed for sale on GEMM, which is a good sign. If anyone is after a copy themselves avoid Moremusic ($54) and Vakuum ($92) cause they're the ones without a barcode.
Of course all this doesn't necessarily mean that the one with the barcode isn't an earlier repress, it's just not the same repress from last year (which, in some cases, also came with a fake mail out promo sheet).
Cheers for everyone's help, especially Wildpitch for supplying the all important barcode.