Bus is classed as Public fund (under immigration purposes)- WHY?

Dear Oxford City Council,

Apparantly Oxford City Council on the following link
(http://www.oxford.gov.uk/PageRender/decT...)
mentions-

You will NOT be entitled to a bus pass if:
• Your main residence is outside of Oxford
• You have a second home in Oxford which you do not occupy
permanently or
• You have a visa limiting your stay in the UK, where you have no
recourse to public funds.

Please clarify if National Bus pass, issued to a disabled person
after a GP's medical recommendation, fall under the definition of
'No recourse to public funds' as per immigration rules?

With reference to section 6A-C of the Immigration rules, the use of
a bus pass is not defined under the definition of "Public Funds",
nor does it appear in the Immigration Directorate Instructions
(IDI).

Furthermore, the use of a bus pass does not appear as a benefit
directly linked to a disability allowance which, under the IDI's
and the Immigration rules, would be classed as a public fund.

Also clarify-
Oxford City Council is denying Bus pass to persons with restriction
on visa as above under which rule?

For your information-
Section 6 of this UKBA website does not include Bus pass as banned
benefit under ‘no recourse to public funds’

http://www.ukba.homeoffice.gov.uk/policy...

also-
BIA website (http://www.bia.homeoffice.gov.uk/sitecon...)
does not include Bus pass as banned benefit and mentions as
follows-

2.2.What counts as a public fund?
The following benefits count as a “public fund”. These link to a
description of each and then a further link to more detailed
information supplied by the DirectGov website.

Attendance allowance
Carers allowance
Child Benefit
Child tax credit
Council tax benefit
Disability living allowance
Income Related Employment & Support Allowance - ESA (IR)
Health in Pregnancy Grant
Housing and homelessness assistance
Housing benefit
Income-based Jobseeker’s Allowance
Income support
Severe Disablement Allowance
Social fund payment
State pension credit
Working tax credit

Yours faithfully,

KG