It was 1977, the year of skin-tight polyester, the Queen’s Silver Jubilee and Saturday Night Fever.  The Sex Pistols were storming up the charts, skateboarding was the latest craze and Angela Rippon danced with Morecambe & Wise. And at Hampstead Theatre in London, Mike Leigh and his cast were putting the finishing touches to Abigail’s Party, ferocious black comedy and landmark of twentieth century theatre. In her suburban living room, Beverly prepares for the arrival of her guests.  She and husband Laurence will play host to neighbours Angela, Tony and Sue.  As the alcohol flows and the ‘nibbles’ are handed…