I can't fault Sebastian here. This started to go in the right direction with people interacting on what was asked then it went back to where it started, TheTiddles and Droog did you not read the earlier posts? All that information is clearly known by the OP and if it weren't then he's shown he's able to use a search engine. He's not arrogant, he's just fed up of you treating this like he knows nothing. Just answer the questions he's asked or go be boring elsewhere.
AJB Temple I don't think he was snapping at you. I'd imagine it's Tiddles and Droog based on what they've posted, it would have annoyed me too
Sebastian I'll try to answer some of your questions:
It could be as has been implied earlier that your cable is 2.5mm, if so it would need to be 4mm, yes. That said, if it is indeed new build you should get in touch with your builder if other electricians independently also confirm it's 2.5mm (don't ask them). If your housebuilder has told you that it should take a 32A car charging commando, then they should also pay for the 4mm cable to be laid. The cost of this might only be £500 so I personally think it's worth doing as it's a bit of a sticky point with the machines you want. They could have also said the wire was 2ga, but I don't know if it would be, as that would be quite meaty I think and would definitely be good enough
As AJB Temple and others have suggested, chisels can be got off ebay and not the end of the world if you get the sharpening a bit wrong. Stanley 5001 (black handle) are very good and not too expensive, the blue handle 5002 are slightly cheaper and very good still
I like my Makita PJ7000 biscuit jointer, I think it's always got a place - I think it's worth getting while you wait of the domino
The BS400 I think is well regarded, no it might not be as good as some of the Axminster Trade ones, I don't know but at about £1000 it's probably the best for the money - happy for people to disagree on this though