Well got my answer today after phoning, faxing and emailing my query hehe!
Thank you for bringing this matter to our attention and we apologise for the spelling error. Given that the error is minor, it is not necessary to re-issue the visas. The Entry Clearance Officer who dealt with the application of your wife and her daughter will annotate their case files which can be accessed by staff in the UK. We will copy this correspondence to the case notes alerting anyone involved with their visas in future to the fact that we have acknowledged the error but that this does not affect your wife and daughter's immigration status.
So now all set to bring them over once we get the CFO sticker! Thanks everyone for yoursupport / comments etc.
