HPI Check

in the process of selling my 5 series and the prospective buyer has asked for some info in order to carry out an HPI check.
Im wary of time wasters and scams and was wondering what is required.
he is currently asking me for:
1.  VIN
2.  V5 registration document serial number
3.  V5 registration document issue date
4.  when was the car last serviced and where?
5. vehicle reg

does this all seem ok?

https://www.hpicheck.com/marlin/HPISample.do

http://www.hpicheck.com/furniture/guarantee.html

These should help. Not quite sure why you need number 4. I didn't need it on a Saab I bought privately in the past

Yes thats all normal mate.

If in doubt ring HPI. They are fairly helpful.. By the way the service history is an important way that HPI and other confirm mileages.