How was J?
It was great! Honestly in a way I liked it better than CX J, because by the CX J bed, the place for your feet is way more cramped. Also, the service on my flight was great, though I understand that can vary greatly from flight to flight.
For sure if you've never been. Go have some food in Golders Green. Isola Bella was great. Metsuyan, a bit pricey but decent. You can go to Windsor Castle its 20 minutes from LHR. City is a bit further.
Thanks, I may very well do that, as all that I've done in London so far is see the city.