This is an environmentally friendly non-cement mortar and is recommended for use on historic buildings. Suitable for joints/beds of 10mm or greater. It comes with a fairly coarse aggregate in the bag and it needs to be mixed. Once applied, it needs to be covered in (initially damp) hessian for a couple of weeks to cure. It has a shelf life of 12 months which means that its use by date is end of March 2026. Description here: https://www.lime-mortars.co.uk/lime-mortar/hydraulic/nhl-3.5/ravenfell/25kg. Up to 5 x 25kg bags available.

Lime mortar, NHL3.5, colour similar to Bath stone, 25kg bags (Lansdown)