Question: What is every episode number for the series number 3?
SQL: SELECT "Episode No. Episode No. refers to the episodes number in the overall series, whereas Series No. refers to the episodes number in this particular series." FROM "1-27208311-1" WHERE "Series No." = 3.0;

Question: What is every episode with Barry Purchese as the writer?
SQL: SELECT "Episode" FROM "1-27208311-1" WHERE "Writer" = 'Barry Purchese';