Second Reading Committees are set up on some occasions in the House of Commons to consider the principles of a Bill in the same way that the House itself does on a second reading. The purpose of Second Reading Committees is to save time in the Chamber. Only non-controversial Bills are referred to these temporary committees, typically non-controversial tax Bills. If a Bill passes through such a committee there is then no debate when the bill is reported to the House for its second reading.
Further information on this subject can be found from the following link.
About Parliament: Bills