LONDON (Reuters) - British house prices rose 10.5% in July compared with the same month last year, slowing from June’s leap of 13.4%, as a deadline for a full tax break for home buyers passed, mortgage lender Nationwide said. In monthly terms, house prices fell by 0.5% from June, Nationwide said on Wednesday. Economists polled by Reuters had expected prices to rise by 12.1% in annual terms and by 0.6% from June. Writing by William Schomberg; Editing by Kevin Liffey Our Standards: The Thomson Reuters Trust Principles.