This luxury Soft-Close alternative / replacement seat and cover comes with top-fixing stainless steel SOFT CLOSE hinges as standard, whereas the original Armitage Shanks Astra was never 'soft close' and came with plastic hinges.
 
This is available in White and limited remaining colours to special order. The photo's show the seat specially re-coated to SUN KING
 
NB  This is NOT an Armitage Shanks product, but the dimensions match the Astra's.