Can anyone help with finding a geographical number to call the Health in Pregnancy Grant office helpline (it is a government office, run I think by JobCentre Plus). The number they give out is  0845 366 7885 . Annoying enough not to know what's happened to my grant, but to pay to find out the answer is even more galling.

Thanks for your reply. HiPG stands for 'Health in Pregnancy Grant' - sorry if that wasn't clear. 
There is a postal address - see below.  Also a textphone/miniphone number
HM Revenue & Customs Health in Pregnancy Grant
Comben House
Farriers Way
Liverpool
L75 1AX

I Googled hipg and it took me to the HMRC website. From there, I found this page:

http://www.hmrc.gov.uk/hipg/how-to-claim.htm#6

It gives an address:

HM Revenue & Customs Health in Pregnancy Grant
Comben House
Farriers Way
Liverpool
L75 1AX

[…]

Need further help?

You can contact the Health in Pregnancy Grant Office in a number of ways.

You can email a general enquiry by following the link below or you can contact the Health in Pregnancy Grant Helpline. The Helpline is open between 8.00 am and 8.00 pm every day except Christmas Day, Boxing Day and New Year's Day. The numbers you can ring are:

    * Tel 0845 366 7885
    * Textphone 0845 366 7886 - if you are deaf or have a hearing or speech impairment

If your preferred language is Welsh you can call on:

    * Tel 0845 302 1489

IIf you’re calling from overseas you can also contact the Helpline on:

    * Tel + 44 292 050 1178

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Try this "overseas" Cardiff number, 029 20501178. I suggest you withhold your number using 141 if it isn't withheld automatically.