The model 28 was the utility version of the higher priced and more highly polished 27. fewer barrel length options, no top strap checkering, and any color you wanted as long as it was blue.
Through the years the appearance of the finish varied depending on just how much cursory polishing the production run actually got. I've seen some that have a flat matte looking finish and some that almost had a nice blue-black polished look to them.
As most will tell you, the purists say don't re-blue it. Money-wise they are right. Destroys any potential collector value and the money spent usually is more than what you could recoup from the work if you decide to sell it.
But we want what we want and there are enough 28's out there that many have been polished, re-blued, nickeled, hard chromed and even >shudder< Parkerized. I have seen a couple, badly abused, that I thought if I could pick it up cheap enough a nice hard chrome (Metaloy) job would be in order.
Bottom line is it's yours to do with as pleases you. If you have the money and that's what you want - go for it. As far as putting it back to original, to each his own. If I was going the refinish route on a 28 I'd probably spiff it up a bit since they are easy to find in good condition (over here). In your case, it's easier to understand in the UK why one would want to have it look original since the opportunity to replace it is probably between slim and none.
