Etihad served just two UK airports in 2025, London Heathrow (2,923 flights) and Manchester (1,257), and the share of disrupted flights is identical at both, 0.7%. That is less than half the national average (1.6%), so your choice of airport made no difference to the risk.
Why you should read that 0.7% as a range
There are few flights, and every disruption moves the percentage. At Manchester there were 9 disruptions over the year (5 flights 3+ hours late and 4 cancellations), and the 95% range there runs from 0.4% to 1.4%. So comparing Etihad with Emirates by tenths of a percent is pointless. The Manchester – Abu Dhabi route counts all airlines together.
If your departure to Abu Dhabi is delayed
It is 5,516 km from London Heathrow to Abu Dhabi. On a flight longer than 3,500 km, the right to care starts after 4 hours' delay to departure: food and drink, two phone calls or emails, and, for an overnight delay, a hotel room and transfers. Compensation is worked out separately, on arrival: £260 for a delay of 3–4 hours and £520 for longer, according to the guidance from the UK Civil Aviation Authority (CAA).