Liquid DPC Damp Proof Course Injection Cream

Hi all I was wondering if anyone has and experience of using products like the one below https://www.restorationuk.com/damp-proofing-products/damp-treatments/product/focus-damp-proof-1l-cartridge-tubes Because its an old house with some instances of rising damp my builders advised that I get a DPC injected, so I went ahead and got someone out to do it, so they have drilled a load of holes in the mortar and injected the mentioned liquid/cream. They weren't able to i

I have an 1865 terraced cottage. Suspended wooden floors, lime/horse hair plastered walls, solid brick walls with no cavity. When I bought it in the early 90s the first thing I did was fit uPVC windows WITHOUT trickle vents & add central heating. The plastering is very thick so to build it up I shot down to Wickes and bought browning or bonding, can't remember which! I cleared the air bricks front and rear. The house is only 12' wide. Looking at the front of the house, on the RH