A Sweet Glam No. 1 Siren SmashThe Sweet’s "Blockbuster"  backed with "Need A Lot Of Lovin'" , was released as a 7-inch vinyl single in the UK by RCA Records (catalog number RCA 2316) on January 5, 1973, entering the UK Singles Chart on January 13, 1973, peaking at number 1 for 5 weeks and charting for 15 weeks. "Blockbuster" was the groups first number one and only number one single in the UK, and also made 1 in the Netherlands, Germany, Austria and Ireland, and 3 in Finland,