Exactly like mine and yes pretty heavy and you will need to clean round the joint before you can get it out. I use an old fashioned bone handled tabll knife.
Yes, if the original one is a spur you can just feed the new one from the downstream/output side. In fact even it it's not a spur.
I would not think you are likely to need the controller powered when there is no power to the opener.
Ah, yes, that is not just a switch it is also an RCD, so we can deduce that this is a TT supply and that you have an earth rod somewhere (photo of the earthing/bonding for completeness pls). Proceed exactly as ETAF suggested and let us know the result.
As above - however-
"and trips the main switch connected to the meter."
The main switch shown in your consumer unit does not have a trip function - which "main switch" are you referring to? Picture?
PS: That MK B20 MCB on the far left is not approved for use with the Wylex CU. Hopefully all...
The phone socket on a BT hub is for a normal analog phone and connects to BTs VoIP service.
Additional analogue phones can be connected using adapters available from BT which plug into a power socket near the phone and communicate with the router over Wi-Fi and also take normal analog phones or...
I'm guessing you bought it through Amazon rather than from Amazon.
Inventor are a UK registered company, their contact details are available on Amazon so you could contact them directly.
E1 suggests it's a common error; a likely cause is loss of refrigerant pressure - you'll need a suitably qualified engineer to top it up. In any case messing with aircon is not really a diyjob and can be hazardous.
Just connect the spare core to the earth terminal at each end (as well as the (hopefully G/Y sleeved) earth core). Then it's there if you need it in the future.