In response, my first pass anwer, FFF, would be a resounding 'NO' to all of the above. I'm sure that others will have different views / interpretations, but I've looked at the
Air Navigation Order (CAP393) Section 7 Page 5 (which is on Page 365 of the PDF file), which contains a lot of info, including:
Requirement for approval of operator
4 (1)An aircraft shall not carry or have loaded onto it any dangerous goods unless;
(a)the operator is approved under this regulation;and
(b)such goods are carried or loaded in accordance with:
(i)any conditions to which such approval may be subject;and
(ii)in accordance with the Technical Instructions.
(2)An approval under this regulation:
(a)shall be granted by the CAA if it is satisfied the operator is competent to carry
dangerous goods safely;
(b)shall be in writing;and
(c)may be subject to such conditions as the CAA thinks fit.
Prohibition of carriage of dangerous goods
5 (1)Subject to paragraphs (2)and (3)a person shall not:
(a)deliver or cause to be delivered for carriage in,or
(b)take or cause to be taken on board;
an aircraft any dangerous goods,which he knows or ought to know or suspect to be
goods capable of posing a risk to health,safety,property or the environment when
carried by air,unless the Technical Instructions have been complied with and the
package of those goods is in a fit condition for carriage by air.
(2)Subject to paragraph (3),these Regulations shall not apply to those dangerous goods specified in the Technical Instructions as being:
(a)for the proper navigation or safety of flight;
(b)to provide,during flight,medical aid to a patient;
(c)to provide,during flight,veterinary aid or a humane killer for an animal;
(d)to provide,during flight,aid in connection with search and rescue operations;
(e)permitted for carriage by passengers or crew members;or
(f)intended for use or sale during the flight in question.
I suppose there is an argument that you are intending to use the goods during the flight in question!!
Personally speaking, I would view it as a bad idea and worthy of a slight detour to uplift fuel from a site en route. As I said, this is from personal outlook alone and not just based on the ANO.