Second one Charles I shilling, again the mint marks are not the best looks like a crown this would be Aberystwyth Furnnace
Obverse Lettering - CAROLVS. D.G. M.A. B.R. F.R. E.T. H.I. REX
Reverse Lettering - CHRISTO AVSPICE. REGNO
Issued between 1648 and 1649
I hope this helps @Cornishfarmer please don't take what i have written as gospel, as Charles I hammered coinage is vast field so many different mints, parliament and the civil war mints its a mine field and not my area of interest. if you want i could copy your images and show them to some people with a lot better knowledge than me who could give better answers?