You can add URL Parameters to create and link to more specific filtered maps. The first parameter must be preceded by a ? and any others must be separated by an &.
eg - http://principalfish.co.uk/electionmaps/?map=prediction&incumbent=conservative®ion=wales will only show Conservative seats in Wales on the Nowcast map.
map=prediction : Nowcast
map=predictit : Predict 2022
map=current : Current Parliament
map=election2017 : 2017 Election
map=election2015 : 2015 Election
map=election2010 : 2010 Election
map=election2017_600seat : 600 seat - 2017
map=prediction_600seat : 600 seat- Nowcast
incumbent=party : see party codes below
region=region : see region codes below
majlow=integer : Majority/lead low bound
majhigh=integer : Majority/lead high bound
gains=yes or true : Gained seats (only on filters on Election Maps/Prediction)
byelection=yes or true : By-elections (only on filters on Current Parliament)
conservative : Conservative
labour : Labour
libdems : Lib Dems
ukip : Reform
green : Green
snp : SNP
plaidcymru : Plaid Cymru
dup : DUP
sinnfein : Sinn Fein
sdlp : SDLP
uu : UUP
alliance : Alliance
england : England
scotland : Scotland
wales : Wales
northernireland : Northern Ireland
eastofengland : East of England
eastmidlands : East Midlands
london : London
northeastengland : North East England
northwestengland : North West England
southeastengland : South East England
southwestengland : South West England
westmidlands : West Midlands
yorkshireandthehumber : Yorkshire & Humber