Decimal degrees to northing easting

Convert BNG to Lat/Long Enter into a British national grid six or seven figure numbers to facilitate and northing to return decimal latitude and longitude. For example, 429 157, 623 009 will return -1.54, 55.5 WGS84 (SRID 4326) Enter decimal latitude and longitude to return a number of six figures to facilitate and northing of the British ... ................
................