Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Ship | Type | Nationality | Tonnage GRT | Fate |
| --- | --- | --- | --- | --- | --- |
| 5.12.1914 | Charcas | Freighter | British | 5067.0 | Sunk |
| 11.12.1914 | Jean | Sailing ship | French | 2207.0 | Retained as collier Scuttled 31.12.14 |
| 12.12.1914 | Kidalton | Sailing ship | British | 1784.0 | Sunk |
| 26.1.1915 | Isabel Browne | Sailing ship | Russian | 1315.0 | Sunk |
| 27.1.1915 | Pierre Lott | Sailing ship | French | 2196.0 | Sunk |
| 27.1.1915 | William P Frye | Sailing ship | American | 3374.0 | Sunk |
| 28.1.1915 | Jacobsen | Sailing ship | French | 2195.0 | Sunk |
| 12.2.1915 | Invercoe | Sailing ship | British | 1421.0 | Sunk |
| 18.2.1915 | Mary Ada Short | Sailing ship | British | 3605.0 | Sunk |
| 19.2.1915 | Floride | Freighter | French | 6629.0 | Sunk |
| 20.2.1915 | Willerby | Freighter | British | 3630.0 | Sunk |
Question:
what is the least tonnage grt when the nationality is british and the ship is kidalton?
Answer:
1784.0