Letter frequency for letters and their neighbours

I'm looking for a resource that shows letters and their most common immediate neighbours. Does anyone know one for Latin script languages? I know the COD provides some pairs for diacritic glyphs. And that Latin+ has some info on 'leftish' and 'rightish' neighbours — meaning they are merely left or right of them. 

Edit: I realised what I'm looking for are lists of bigrams by frequency for each letter.