u/hellaurie

Hi r/stonemasonry and associated stone experts. I'm looking for some guidance on how to fix this stone slab which my dad used as part of one of his many letter carving projects. Unfortunately he passed away recently after a 5 year battle with Alzheimer's. I inherited this piece and it's one of my favourites pieces of his.

Does anyone know how I might go about fixing the two halves back together? And what the best products (I'm in the UK) would be for cleaning the front?

Thank you so much for any help you can give.