Hi Froggy
That looks like a Paramo #10 Planemaster. It used replaceable blades which you can find on ebay. I made one from a HSS jigsaw blade. I haven't done any work with it, I just made a few passes to see if my blade would work. It made shavings.
I bought the plane at a flea market (boot sale in your lingo I think) for not very much. I was impressed that such a cheap plane would have a cast iron body. It's a cheap plane and I don't have any great expectations about its performance. It should work for basic shaping but I wouldn't use it for finished surfaces.
Based on appearances, I think your Stanley is comparable.
John