What british legislative body is the equivalent to the US house of representatives?

In UK there are two Houses in Parliament: The House of Commons, which is an elected assembly of 650 or so MPs (Members of Parliament). In the upper House, the House of Lords, which ratifies the work of the Commons, the members are not elected, but the number of herititary Lords are now relatively few these days, most are what are called Life Peers. I suppose the 'Congress' is therefore the Commons & the Lords is the equivilent of the House of Representatives, if I understand my US politics the right way round !