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 | Region | Label | Catalogue | Format |
| --- | --- | --- | --- | --- |
| 8/Nov/1980 | UK | Bronze | BRON531 | vinyl |
| 8/Nov/1980 | UK | Bronze | BRONG531 | Gold vinyl |
| 8/Nov/1980 | Italy | Bronze | BROL 34531 | vinyl |
| 8/Nov/1980 | Germany | Bronze | 202 876-270 | vinyl |
| 8/Nov/1980 | US | Mercury | SRM-1-4011 | vinyl |
| 1986 | UK | GWR | GWLP6 | vinyl |
| 1986 | UK | Legacy Records | LLMCD 3013 | CD |
| 1988 | US | Profile Records | PCD-3243 | CD |
| 1988 | US | Profile Records | PRO-3243 | vinyl |
| 1991 | UK | Castle Communications, Castle Classics | CLACD 240 | CD |
| 1996 | UK | Essential, Castle Music | ESM CD 312 | CD |
| 2003 | Italy | Earmark | 41003 | Red vinyl |
| 28/Jan/2003 | UK | Silverline | 2881339 | DVD-Audio |
| 2005 | US | Sanctuary | 06076-86408-2 | 2xCD |
Question:
Which catalogue has essential, castle music as it's label?
Answer:
ESM CD 312