House prices in the UK take a surprising plunge in December, with average asking prices dropping more than expected, according to Rightmove. The subdued housing market is linked to last month's government budget, which included plans for a new tax on high-value homes. Will this trend continue into 2026, or is a rebound on the horizon? Find out the latest details in this exclusive report by Eamonn Sheridan at investinglive.com.