Mark Pack
Liberal Democrat activist and analyst who tracks council by-election results.
Last refreshed: 13 April 2026 · Appears in 1 active topic
Which party is actually gaining ground in council by-elections right now?
Timeline for Mark Pack
Mentioned in: 65 Reform councillors gone in a year
UK Local Elections 2026- Who tracks council by-election results in the UK?
- Mark Pack runs the most-followed council by-election tracker at markpack.org.uk, monitoring ward contests to identify national trends before they show in polls.Source: uk-elections-2026
- What does markpack.org.uk track?
- It tracks UK council by-election results, aggregating ward-level data to identify trends for parties like Reform UK, the Greens, and Lib Dems.Source: uk-elections-2026
- How many Reform UK councillors have quit since 2025?
- 65 of the 677 Reform UK councillors elected in 2025 had quit, defected, or been expelled by April 2026, per HuffPost UK data.Source: uk-elections-2026
Background
Mark Pack is a Liberal Democrat activist, writer, and former party co-chair who runs the UK's most-followed council by-election tracker at markpack.org.uk. His data was cited in reporting on Reform UK's internal collapse after 65 of 677 Reform councillors elected in 2025 quit, defected, or were expelled within a year , underscoring the value of granular local-election monitoring that Pack pioneered.
Pack has built a reputation as the go-to source for sub-national election data in British politics, filling a gap left by mainstream polling. His tracker aggregates results from hundreds of ward contests each year, making it possible to spot national trends — such as Reform attrition or Green gains — before they register in Westminster polls.
In the 2026 local election cycle, Pack's work feeds directly into the emerging narrative of council politics as a leading indicator for general elections. As Labour and the Greens drew level at 16% each in YouGov national polls, council-level data from analysts like Pack provides the ground-truth against which seat projection models are tested.