Tariq (and the BBC webpage he brings up) state a new aircraft carrier is being launched in Plymouth. The BBC News later states it's a Type 45 destroyer. Also, ships aren't built/launched in Plymouth.
Tariq's thermal satellite display shows the latitude incorrectly labelled as longitude, and vice versa. Further the coordinates do not refer to a location in London but north of Luton. Also, satellites in low earth orbit are not conveniently over London at the right time, nor are they stationary.
The IP address given for Talwar's computer is 810.924.16.48 which is an invalid IP address.
The ship's initial location once underway is specified as 27.09N, 5.2W, which is not only south of its port of departure (when it's supposed to be heading north), but also landlocked in Algeria, not in the "North Atlantic Ocean" as stated.
The ship's position as seen by Tariq is two thirds of the way to Newfoundland and nowhere near the route it should take from Morocco to the UK.
The ship's second position is stated as 36.31N, 12.08W, and 12 hours from UK Coastal Waters. That lat/long is due West of Gibraltar and much more than 12 hours away from the UK.
The ship's third position is stated as 39.63N, 17.27W, and 8 hours from UK Coastal Waters. This is 316 nautical miles from the last point and gives a ship speed of 79 Knots, which is impossible. It's also still too far away from the UK to be sailable in 8 hours.
Two hours later the ship's position is 46.58N, 12.39W, a further 468 nautical miles (or 234 knots!)
Harry takes the poisoned whisky and the two glasses away. However, an autopsy would reveal whisky in Blake's stomach but no evidence of a glass or bottle in the room (even if the poison was undetectable). This would raise suspicion.
From the time Lucas gets away in the lifeboat to being safely ashore in Spain is less than four hours. That's an unfeasibly short time.
1 of the terrorists who seize the ship greets another with "Shalom", the Hebrew greeting for peace. These men are radical Muslims and the standard Islamic greeting is the Arabic "Salaam".
While 50d21m27.8208s N, 4d8m45.477s W is indeed in Plymouth Sound, the engineer incorrectly types the longitude in as S (south), not W (west).