Just do this quest over and over or there are people that sell stacks of the hand in items in EC tunnel for about 10pp each.
http://wiki.project1999.com/Rebby's_Rat_Whiskers
Your faction standing with Coalition of Tradefolk Ill got better. (+7)
Your faction standing with Coalition of Tradefolk got better. (+7)
Your faction standing with Carson McCabe got better. (+1)
Your faction standing with Corrupt Qeynos Guards got better. (+1)
Your faction standing with The Freeport Militia got better. (+1)