[isatrader]

I've discovered that stockcharts.com now has advance decline data for the LSE, and covers around 1663 issues currently. The data only goes back five years, but attached is the normal chart I show with the one year chart, momentum index and 10 MA oscillator. And also the full six years for context.

Here's the symbols:
$LOAD LSE - Advance-Decline Issues
$LOADU LSE - Issues Unchanged
$LOADV LSE - Issues Advancing
$LODEC LSE - Issues Declining
$LOTOT LSE - Total Active Symbols