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 | Name | Nationality | Tonnage (GRT) | Fate |
| --- | --- | --- | --- | --- |
| 17 March 1943 | Alderamin | Netherlands | 7886.0 | Sunk |
| 17 March 1943 | Fort Cedar Lake | United Kingdom | 7134.0 | Damaged |
| 17 March 1943 | Granville | Panama | 4071.0 | Sunk |
| 17 March 1943 | King Gruffydd | United Kingdom | 5072.0 | Sunk |
| 17 March 1943 | Kingsbury | United Kingdom | 4898.0 | Sunk |
Question:
Which Tonnage (GRT) has a Nationality of united kingdom, and a Name of king gruffydd?
Answer:
5072.0