Bellingham first entered Parliament at the 1983 election after winning the seat for North West Norfolk, having defeated the incumbent MP Christopher Brocklebank-Fowler, who in 1981 was the only Conservative to defect to the newly formed SDP. He held his seat until being defeated during the 1997 election. He contested his former seat at the election in 2001, and won it back. He was re-elected in 2005 with a 9000 vote majority, and again in 2010 with a majority of 14,810. He was re-elected at the 2015 general election and 2017 general election.