Thanks lizdb for your interest and for the welcome, always a bit scary making the first move.
The Reuben you have found on the 1901 cencus is in fact Reuben jnr's father.
Reuben jnr can be found on the 1881 cencus aged two living with father Reuben Springthorpe, mother Eliza, brother Joseph who was my g'father and half brothers and sisters Rachel, Henry, Ada and Ellen.
After this the family gets very complicated and Reuben can eventually be found on the 1901 cencus living in Wales under the name of Kibby, working as a carpenter, as a boarder. His mother Eliza is living with her new partner, Edward Plunkett, and two sons Joseph and Edward in Leicester under her maiden name of Kibby also.
After years of being puzzled by my dad's comment about a name change to Kibby (that's all he would say!) the breakthrough came through GR earlier in the year through contact with, amongst others, Revmother2.
It's taken quite a few heads in all parts of the country and in the USA to sort all that out but Reuben Jnr's g'daughters who are fairly far flung would really love to find out more about the bank doors and some possible confirmation that he did in fact make them.
Any comments would be most appreciated, thanks Spannerpam.