user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Elections in the 1980s' regarding 'Derby South (UK Parliament constituency)'
Table Content:
| Party | Party | Candidate | Votes | % | ± |
| --- | --- | --- | --- | --- | --- |
| - | Labour | Margaret Beckett | 18,169 | 39.3 | −10.7 |
| - | Conservative | G.W. Hales | 17,748 | 38.4 | −0.3 |
| - | Social Democratic | I.W. Smith | 9,976 | 21.6 | +11.9 |
| - | Ecology | E. Wall | 297 | 0.7 | N/A |
| Majority | Majority | Majority | 421 | 0.9 | −10.4 |
| Turnout | Turnout | Turnout | 46,190 | 67.4 | −4.0 |
| - | Labour hold | Labour hold | Swing | - | - |


Question
By how many votes did Beckett win the Derby South (UK Parliament constituency) election over the Conservative party?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["In the Derby South (UK Parliament constituency) election, Beckett won with a majority of 421 over the Conservative Party."]