OP, my friend's wife is a Khmer living in England and when she first came across from Cambodia (in itself I seem to remember this wasn't plain sailing) I know that the initial thing which she found difficult to deal with was the low temperatures, even in our Summer. Consequently the home they rented was Sauna-like to say the least.
You should also note that there are not too many Khmers living in the UK - so I will imagine that there a good deal less in Eire. This may sound no big deal to you but to the friend's wife it took a long time to adjust to this. Now she has made a few friends, mainly Thais from the Eastern provinces. But still Thais are Thais and Khmers are Khmers. From what I can gather the Khmer community seems centred around London. (There is/was a summer get-together each year but I would have to search my memory for it if requested).
As we know families figure larger in the life of SE. Asians than for many Westerners as well as expecting lengthy telephone calls back "home" expect the reverse at all hours also. Once in Europe you may find that your partner is expected to send more money back "home" than you may be comfortable with or indeed get bank loans, etc. to pay for things back "home". No doubt you have heard the Thailand ex-pat "sick-buffalo tales". Expect all manner of emotions if a close relative succumbs to something nasty and your partner is not able to return To Cambodia. Something which I have witnessed.
Yet everything which I have written above pales into insignificance with the following : If you want to keep your partner sweet, for the love of all things Holy, ensure than she has easy access to foods which she is used to. Failure to be easy distance from a Chinese/Thai supermarket may make your life Hell.
Okay after so much seeming negativity I can tell you that my friend and his wife are still together after there marriage in 2003. (A ceremony which I attended in Phnom Penh). Most of this spent in NE England after a stint near London almost on their arrival in the UK.
As a long shot try looking on the following site : www.Thaivisa.com
Although, as the name suggests, it is focused on Thailand/Thais there are often questions, etc. raised concerning partners from the neighbouring countries.
Good Luck.
