Been looking into this IPP thing and the definition on the governement website is as follows:
“a protected person” means, in relation to an alleged offence, any of the following, namely—
(a)a person who at the time of the alleged offence is a Head of State, a member of a body which performs the functions of Head of State under the constitution of the State, a Head of Government or a Minister for Foreign Affairs and is outside the territory of the State in which he holds office;
(b)a person who at the time of the alleged offence is a representative or an offical of a State or an offical or agent of an international organisation of an intergovernmental character, is entitled under international law to special protection from attack on his person, freedom or dignity and does not fall within the preceding paragraph;
(c)a person who at the time of the alleged offence is a member of the family of another person mentioned in either of the preceding paragraphs and—
(i)if the other person is mentioned in paragraph (a) above, is accompanying him,
(ii)if the other person is mentioned in paragraph (b) above, is a member of his household;
I think Section C would cover Harry if he was on official duties or on private visits to senior royals classified as IPP's but as far as any further entitlement goes it looks like he's stuffed.