Ok @PithyBeaker relax
Thinking classics, your son can enjoy GCSEs (his secondary work will get harder honestly enjoy the fact it’s a breeze for him whilst he settles in) and you can look for a great 6th form that has classics, you don’t need classics GCSE- history and English literature are the subjects that will give him the skills for the a’level - it will be fine
and you can rephrase the “big empty house” into a house big enough for you, your son, your and his friends and family to enjoy. If your house is so cold and heartless why did ex insist that your relationship had to include it?
if you sail and hike and cycle you need a lot of storage for all that gear!
enjoy what remains of the mild, outdoor enjoyable weather, ask son to stick a new ding or two on Spotify at dinner so you can be introduced to the new music from the youth of the day
book a trip to Athens?
go and see Elgin marbles at British museum and have a long discussion of the political controversy around those bits of old marble!
you are not failing at all
use the drive to sing together or chat it has to be done might as well have a benefit to it
but really school will ramp up don’t wish it to happen sooner your son will be fine, thrive, he has the breathing space to express himself more now and you will need it - you will have a house full of teenagers of your son’s choosing before you know it, hope you have a “soda drinks in fridge” budget, oh and snacks, and pizzas and baked potatoes and and and……teenage boys once they get growing are bottomless pits in the food department, throw in sailing, hiking, cycling and you will have no time to be bored there will be another lasagne to make!