How to correct this pointing?
I'm a novice DIYer also from Calderdale. I recently repaired some pointing on a similar type of property. Unfortunately it doesn't match the rest of our pointing but I prefer the look of the result i'd be tempted to repoint the rest of the house.

Rake out the dead pointing, i used a mortar rake disc on mini grinder.

4 sand 1 cement and some plasteciser (in place of lime) from B&amp;Q as quantified on the packaging.

I was advised from a few builders but other than that I probably know as much as you from online forums! :)