St. Mary’s in Haddington is, with St Giles Edinburgh and St. Michael’s Linlithgow, one of the three great medieval churches of the Lothian’s. Services are held each Sunday at 09.30 and 11.00. St. Mary’s is the longest parish church in Scotland, with Lauderdale Aisle an Episcopal Chapel within a Church of Scotland building, an index of the graveyard and map are available. The Church is open for Easter weekend and from 1st May to the end of September (11 - 4, Sunday 2-4.30) with guide, tearoom, bookshop, gift shop and brass rubbings by arrangement.