By Jessica Frank-Keyes From energy firms and Treasury bean counters to childcare staff and first-time buyers, there are a myriad of reasons to be glued to the pre-Spring Budget rumour mill. But for anyone looking to invest in bricks and mortar, the contents of Jeremy Hunt’s Spring Budget red box will likely be a source of more than a little fascination. Speculation has been mounting that the Chancellor could be set to announce a series of buyer-friendly policies on 6 March, from 99 per cent mortgages to cutting stamp duty. Coupled with the fact the housing market recorded a record sales slump …