If you haven't already looked at:
https://www.workshopheaven.com/hand-too ... ories.html
It's worth it, as they do:
- Clifton blades;
- Japanese blades mentioned upthread (only disadvantage as far as I'm concerned is can't use diamond stones to sharpen);
- Replacement adjuster yokes;
- All the Quangsheng gear (including replacment blades) - which I find excellent value for money.
If it were me, I'd want to try and avoid filing the mouth of my old plane and ideally also avoid fitting a new adjuster yoke - which implies a fairly thin replacement blade.
Another option is the Veritas PM-V11 steel replacement blades designed as a direct replacement (they also do a matching chipbreaker)
https://www.axminster.co.uk/veritas-pm- ... s-ax937586
I really like PM-V11 steel, but would find sharpening it without diamonds a bit boring.
I think that it's possible to get a great deal of planing pleasure and performance from the original blade/chipbreaker combo - whether or not you have upwards of £50 spare to spend on new blade/CB. I haven't yet bothered, but if I did upgrade an old plane, I'd use the PM-V11 option.
Cheers, W2S