Again, many thanks for your input groom, and thanks for joining in Maureen!
I've now found the files you're both referencing and have tracked (*) Klesel until 1980. I do hope the trail doesn't run out at this point............
Very odd that there's a change of name without a marriage? At one point I did wonder if the name had been Anglicised (at the time of WW1) but since then I've traced the line back to 1800, so that can't be the case!