I'm checking if this is correct following a towbar install. The indicators flash twice when using either the all doors open button or the boot open button. I'm sure, before the towbar fitting, the indicators didn't flash with the boot opening button - they did with all doors open button. And when opening the boot after unlocking it makes a noise - hard to describe but like an electrical / moving part hum. I don't recall hearing this before the towbar fitting. 

On the remote? Who did the install?

A local guy did the towbar - his own business.

All the locks work it's just the indicator flashes twice when using the boot open button on the key fob now. I'm certain it didn't before. 

From 2019 Owners Manual - 

"Central locking system

The system unlocks and locks all doors, the fuel filler flap and the boot lid at the same time.

Unlock indicator: double flashing of the indicator lights.

Lock indicator: single flashing of the indicator lights.

The warning light in the driver's door will flash for about 2 seconds in quick succession after the vehicle is locked, then it will start flashing regularly at longer intervals."

 

Are you sure the boot, all doors and fuel cap are all locked after pressing the button?

 

Have you checked to see if the warning light in the driver's door operates as above? -

 

"Central locking fault

The warning light in the driver's door first flashes for 2 secs in quick succession.

Then it lights up continuously.

After 30 secs, it flashes slowly."

 

Might not do anything but as it's free, quick and easy have you tried synchronising the keyfob (see "Mechanically unlocking and locking the door" in Owner's Manual for more details -

 

"Synchronize the key [fob] as follows.

Press one of the buttons on the key [fob].

Unlock the door within 1 minute with the key [blade] via the locking cylinder"