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Mock exam questions very often do not crop up in the real exam. Your tutor sounds typical of the modern system, they follow the guidelines and can offer no argument because they are clueless and technically inept.

Look at figures 3A1 to 3A6 in Appendix 3. Don't worry it is not on the hand outs you are learning how to navigate BS7671.

I agree that is poorly worded.

Question 1 sort of answers itself, absorbent in the question watertight in one of the answers. Question 2 I would argue there are two answers. b) long vertical runs place undue stress on conductors. c) premature collapse in the event of a fire (see Section 521). Question 3 you are correct.

Mmm what do I need. Let me think, I've got it a dual tariff consumer unit.

I assume you don't have an electrician on board?

No in the UK there are no legal restrictions on people carrying certain electrical works although some of it must be notified there is nothing stopping the home owner from doing this.

Didn't see the top line in #1. Not 100% sure to be honest.

Being in Southern Ireland it would be illegal unless you are an REC to interfere with your consumer unit.

Northern or Southern Ireland?

Are you sure the light isn't tagged from the power circuit?

Be fine just sleeve any damage.

It isn't untidy.

From my collection of random cable.

Installed some of this at Pinewood Studios in the late 80s have no idea where they obtained it from could have been specially made as they had their own ideas there.

They are commonly used to joint cables.

Many commercial fan heaters will have it's rating in KW along with a separate rating for the motor. As they are not solely resistive they are not fixed loads.

It isn't a ring final circuit.

They aren't fixed resistive loads, the heater incorporates a motor.

No each final circuit requires separate circuit protection.