The amount of auction finance you can secure for a house in the UK typically depends on several factors, including the value of the property, your credit history, income, and the loan-to-value (LTV) ratio that lenders are willing to offer. Most lenders offer auction finance up to a certain percentage of the property's value, often around 70% to 75% LTV, but this can vary. Your financial situation and the property type will also influence the amount you can borrow. It's best to consult directly with lenders or a broker to get a precise figure.