Sad or what, replying to my own post...
I've been on eBay and there is a similar plane at £3.99, so I guess that answers my question about quality. I'll clean it up a bit as a practice piece and use it for sharpening skills development...
Now - I'm almost completely unskilled with hand tools, but I want to be able to use them with enough panache to make passable stuff in a primitive style, if you see what I mean. My workshed is at the bottom of the garden so evening work needs to be hand tools, quite apart from the extra fun.
What do I do for planes? I'm not going to commit to the serious stuff for the moment - as a newbie I may end up hating using handtools or may just be useless with them. So I'm looking at Stanley stuff, and I know that secondhand (pre electric planers) stuff may well be better quality than new. It's a bit of a lottery, though, in terms of condition.
New is easier to use? Or will a new Stanley need fettling?
What sizes? I am going to be dimensioning wood for making bookshelves, small cupboards, box-drawer units etc. Not fine furniture making. I hope to be sourcing some French oak, possibly some ash, but it will probably be kiln dried rough sawn.
My thought is towards a 5, possible 5 1/2, will that be a good start?
There are lots of cheap No 4s on eBay - is there a reason for that?
What about rebating and routing planes? Are they really of use for a newbie like me?
Come on, guys, there's a potential galoot here - let's have some encouraging answers!