There is a 100 year rule, that prevents information being available, which also includes WW2 records. As he was born in 1942, his records will not be available until 2042, so the best route would be local newspapers.
There is a birth, for a Thomas Seddon in Jan-March 1942, which is before you say he was born, so maybe not him. If it is worth looking at his mother’s maiden name was Pendlebury, with the registration in Farnworth Volume 8c Page 653