CAF application form UTR/TIN number

Uxb1

To save me spending XX time on the phone to CAF
The CAF bank application form asks what country is your tax residency. (answer UK)
Then it ask for our TIN/UTR.
Well we don't have one do we.....

If we don't have one we are required to choose
1. The country or residency does not issue TIN/UTR
2. We are unable to obtain a TIN/UTR - please state why below
3. No TIN is required - only applicable if the country's tax authorities do not require the TIN to be disclosed

I suppose I could enter up our HMRC gift aid number in place of the TIN/UTR

Any advise as to what is the correct answer?

penners324

Charity number 

Uxb1

Cheers - thank you:
never thought of that as being the answer