Clive D. W. Feather wrote:

Camden Town's not cross-platform?

Actually only the northbound connection is level - the southbound
passageways involves stairs to connect to them. There's also much more
vertical overlap than you show. Making an attempt to edit your
artwork:

_____ _____
/ \______________________________/ \
NB Ew ____________ ____ ______ NB HB |
\_____/ _/ _| |_ \_ \_____/
_____ _/ _| |_ \_ _____
/ \__/ _| |_ \_____/ \
| SB Ew ____| |_______ SB HB |
\_____/ \_____/

While that is true of the middle corridor, is the corridor from southbound
to southbound at the southern end of the platforms not level?