Do World War Two Gas Masks still work?

Today we find out if an old British World War Two gas mask dated 1944 will still work if a modern filter is put on it. The mask featured is the British Light anti-gas respirator which entered service in 1943, this particular mask is dated 1944. An important note is that nearly all old gas masks contain asbestos as a filter medium, this make uses removable filters so I am using a much newer filter than the mask to test it. If you do not know that a mask is safe, you should never breathe through it. The Lig