NOT for the first time, the two main reports on the housing market in March contradicted each other. Nationwide said prices dropped 0.6% - the largest one-month decline since June 1995 - following a 0.5% rise in February. Mortgage rival Halifax reckoned prices rose 0.5%, offsetting February's 0.5% fall. The weight of evidence suggests that, after slowing in the second half of last year, the market is stabilising.