By Andy Silvester She may not have much of a Texan drawl, but Rachel Reeves’ commitment yesterday to no new tax hikes under a Labour government certainly matched the import of George Bush Senior’s commitment more than three decades ago. It is a commitment that we, and much of corporate Britain, will hold her to if Labour does manage to hold onto its substantial poll lead. For Labour, the last 24 hours have been years in the making. It is hard to credit, sometimes, that it is less than five years since the party’s economic policy consisted of Jeremy Corbyn nationalising whatever was in his imme…