Hi,
I don't have morbid curiosity but after the 'success' of Highgate (and the hill climb), interest was expressed in another of the ‘Magnificent Seven’ garden cemeteries of London. Abney park,
https://abneypark.org/ is in Stoke Newington and is free to enter. The easiest route here is a train to London bridge station, then a 30 minute bus ride to Stoke Newington High street. Using London Overground is complicated to get there.
I'm thinking this would suit an Autumn/Winter setting. I've checked trains/TFL engineering to the end of the year and have a few potential dates, you can vote for your preferred options in the poll below.
Sunday 5th November,
Saturday 25th November,
Sunday 26th November,
Saturday 3rd December,
Sunday 17th December,
I appreciate when I tried to arrange the trip to Highgate, we re-scheduled multiple times due to weather and train strikes, I expect similar for this.