We’ve already had two Survation polls for the Makerfield Parliamentary by-election, putting Andy Burnham first three and then ten points ahead. Now a new More in Common / UCL Policy Lab poll puts him five points ahead: The sample size of just over 500 for the mixed phone and online poll is, as with the earlier Survation polls, large enough that any problems with the sample are almost certainly going to be due to its quality rather than its size.