The major issue is fishing*. The IP (I.e. status quo) want to keep quotas which benefit the existing fishing companies. The left + free marketers want fishing auctions, which would let in other fishers. Basically the IP base are status quo people at heart and prefer not to rock the boat, because they have it made. IP's libertarian base want to very much rock the boat by pushing through major reforms - the small c conservatives don't like that sheet. (It's sort of how the Tories try and brush their young keen freemarket disciples under the carpet when Mr and Mrs Wilmington Esq. come in to see what policies they have).
(*if I remember correctly. I will no doubt be messaged on AAD by a pedantic Dane if incorrect lol)
Who knew the left and libertarians would agree on something! I guess I understand the left wing perspective though. LOL I am sure that Mr and Mrs Wilmington Esq. consider themselves free marketers.... well the Thatcherite, special interest type. Anyway, why don't the libertarians build their own new separate party? Especially since there is a proportional electoral system.
