Carol
The cert will hopefully clarify things. If I may say though - the 1901 Clerkenwell Albert J is not the same as the 1911 Wandsworth one. There were two Albert J's, one registered Wandsworth Q3 1899 (thought to be son of Alfred and Rosa) 1911 has birth place as Tooting which is in Wandsworth reg district.
The other is, like all the rest of the family, born north of the river, place given as St Lukes which was part of Holborn dist at that time, registered Q4 1900.
Be interested to hear the result!
MaxD
That all said, it makes him 15 at the time of the Wood/Southwell marriage you started with, doubts creeping in!