Really appreciate the comments so far.Ireland currently has a continuous geoid model, developed in conjunction with the UK.There is also a VORF model ...

Thanks for the comments.Have you any thoughts on how rising sea levels are likely to impact a national datum (in Ireland's case MSL at Malin Head) or...

Thanks Steve and Lee for your help, that TEQC interface seems to be doing the trick. No doubt I'll be back for more advice in near future!!

Thanks for the info.Much appreciated.