Looks like this is the one you need (same as the one in the yahoo link?)
Single wire universal M18 thread?
now you need to find the lambda and see if anyone can help - the part number of the one you posted from japhoo, is a 4 wire one for a Mira L502S/L512S - Move L602S - Mira L700S/L700V/L710S/L710V - if that's the right one the OEM number is 89465-97203-000 but I can't find a generic equivelent.
A kind member on here got back to me and informed me he got a bosch one to fit his jbjl. I think the mystery may have been solved. Will hopefully pick it up tomorrow and get it fitted on friday. Will keep you's updated.
Niall - I take it the part numbers were OK and they found it.
Future reference - I previously traced the daihatsu part number to the bosch equivalent lambda and obtained one for my R4 via eurocarparts their part number was 710770345.