wat dis?
all the local brick repointing/restoration outfits seem to love a tuck pointing, but I think it looks kinda naff if done so-so, and if done perfectly (so you can't see the coloured mortar) it just looks too formal for an ordinary 1920s house.
The neighbours at our previous house in Somerset had the builders in to do some re-pointing to the side of their house. They used bags of hydrated lime instead of hydraulic lime and wondered why after pointing the house for a week, the mortar was not setting.
^ I'd guess builders will use NHL, as it's closer to cement to work with.
It's probably worth finding out though, if nothing else jsutbto check they aren't sneakk in a bit of Portland, as aunt_maud says.
But yeah - soft reds only really get damaged when someone has reported with a cement mortar.
Or that awful dyed brick repair crap that someone has slapped on my place