Well, after a nice chat with my broth I can confirm the bike isn't technically a rourke but sort of is...
The frame was built by Paul Washington/washingham (my bro couldn't remember the name exactly) privately for the swinnertons, he was a frame builder at rourkes but built the frame outside of rourkes' books.
He was used to build the frame for one of the swinnerton girls when the builders swinnertons usually use were unable to meet the order in time for a certain ride/race to have a usable bike, the number holders and other braisons were carried out separately at a later date, the stickers as suspected meant nothing, the frames off cream colour simply leant itself to having Rayleigh stickers applied, when finished it didn't carry these, just the signatures and a date. The tubing is/was 753 the frame they think is from 88 rather than 83 and that's all I got told. Which sort of covers most bases on finding out what's going on. I just wish I knew who'd bothered to get tour of britain and a crest engraved onto the bars, that's still a mystery!