I think for me , a mk1 sk , those nice squashy high backed seats , wood panelling and old world feeling, the reading lights glowing away ,[if the bulbs were still fitted] , i remember travelling up to Waterloo from Salisbury quite late at night in absolutely foul wet weather , hardly anyone else on the train , the compartment felt so cosy and comfortable , mind you i had other trips in unheated filthy mk1 s which were not so nice !!!
regards Paul.