In message , at 12:05:57 on Tue, 11 Dec
2012, Graeme Wall remarked:
They also don't connect well with radial lines. I thought a trip
yesterday to Shoreditch High St was an ideal opportunity to try out the
Overground, but connections to the Cambridge lines are hopeless.

In what sense hopeless, physically or timetable incompatibilities?

A bit of both. One suggested route was via Kings Cross, then back up to
Highbury and then change to Overground.

In practice it's quicker to walk from Old St.

There isn't a direct interchange between the lines, and very few of the
faster mainline trains stop at Finsbury Park (to change for Highbury).
--
Roland Perry