There are two items to remember with questions about time:

1. Time is given using UTC and uses a 24 hour clock.
2. Time is always given in minutes only unless there is any possibility of confusion, then the hour can be included.

Looking at the answer options:

G-KMOO, overhead Cardiff Docks, 1347, 2000 ft, estimating Swansea in 19 minutes --> INCORRECT. Do NOT need to include the hour, just the minutes. Also, the Swansea ETA should be the time, not the duration of flight.

G-KMOO, overhead Cardiff Docks, 47, 2000 ft, estimating Swansea 06 --> CORRECT.

G-KMOO, 2000 ft, overhead Cardiff Docks at 1347, estimating Swansea at 1406 --> INCORRECT. Do NOT need to include the hour, just the minutes.

G-KMOO, overhead Cardiff Docks at 2000 ft time 47, estimating Swansea minute 06 --> INCORRECT. 'Minute 06' is incorrect phraseology. Just give the time in minutes.

ICAO Annex 10 — Aeronautical Telecommunications
Chapter 5

5.2.1.4.1.8. PANS- When transmitting time, only the minutes of the hour should normally be required. Each digit should be pronounced separately. However, the hour should be included when any possibility of confusion is likely to result.

Note: The following examples illustrate the application of this procedure (see 5.2.1.4.3.1 for pronunciation).