Like others say shouldn't be to many questions but worth having your details just incase asked i mean your home address and contact number (mobile i guess as your be waiting in arrivals)
Make sure you have your passport and some other proof of id, if possible. Just in case its needed highly unlikely.
but i remeber reading years back one man waiting was asked to speak to immgration on another forum.
I think Nigel your like me when it comes to your mahal its very important to cover every angle just in case.
Don't forget Vimvie needs to bring a pen for both in the airport in phill and for filling in the immgration form for entering the uk. Its very simple but agains its handy to fill it in while on the plane than panicing while in the queue.
If she is coming in to heathrow she may well be asked for a xray check to check she does not have tb nothing to worry about.
Remind her to pick up her luggage once we had got though the medical check up we nearly forgot but was easy to spot our luggage as it was the only one left on the belt