By City AM reporter Over 100 major London-listed companies, including Fevertree Drinks and YouGov, have written to the Chancellor warning that the uncertainty surrounding the future of a key tax relief tied to London’s junior stock market is battering investor confidence. The letter, reported by Sky News, said that reports suggesting the government could end the inheritance tax relief on AIM stocks “has significantly impacted the ability of AIM businesses to raise capital”. “A lack of clarity on the future of this relief has damaged investor confidence, showing clearly the close link between t…