October 1974 General Election - Blackburn
| Year | 1974 |
| General election | October 1974 General Election |
| Constituency | Blackburn |
| Turnout | 72.9% |
Results
| Candidate | Party | Votes |
| Castle, Barbara | Labour | 20,344 |
| McGaw, Ian | Conservative | 12,692 |
| Beetham, Frank | Liberal | 4,741 |
| Read, John | National Front | 1,758 |