user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Winners' regarding 'British Best All-Rounder'
Table Content:
| Year | Winner (men) | Club | Average speed (mph) |
| --- | --- | --- | --- |
| 1947 | Albert Derbyshire | Calleva RC | 22.744 |
| 1946 | Albert Derbyshire | Calleva RC | 22.843 |
| 1945 | Jock Allison | Musselburgh RC | 22.479 |
| 1944 | Albert Derbyshire | Calleva RC | 23.549 |
| 1939 | - | - | - |
| 1938 | H. 'Shake' Earnshaw | Monkton CC | 22.627 |
| 1937 | Cyril Heppleston | Yorkshire RC | 22.348 |
| 1936 | Charles Holland | Midland C&AC | - |
| 1935 | Stanley W. Miles | Century RC | 21.809 |
| 1934 | Ernest J. Capell | Allondon RC | 21.622 |
| 1933 | Frank Southall | Norwood Paragon CC | - |
| 1932 | Frank Southall | Norwood Paragon CC | - |
| 1931 | Frank Southall | Norwood Paragon CC | - |
| 1930 | Frank Southall | Norwood Paragon CC | 21.141 |


Question
How successful was Frank Southall?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["Frank Southall averaged 21.141 mph and won again the following three years."]