Thanks for the feedback.
I am not sure if the land owners know as the previous holder told me and I have not seen for myself yet due to not being able to get back there, same goes with checking just how 'loose' the wall is, I can not reach it from either side.
I did do some research and the local dump will accept domestic deposits of asbestos. I have copy and pasted it below for the curious:
"Small amounts of asbestos can be deposited at a limited number of household waste recycling centres by members of the public.
All asbestos should be:
double wrapped in heavy gauge polythene sheets (available from DIY stores)
sealed with strong adhesive tape (to prevent the release of dust)
labelled ‘asbestos waste’
Failure to do this will result in the waste being refused;
A maximum of 3 sheets, or equivalent, of asbestos from householders, per month, that measure no more than 20cm high, 150 cm wide and 180cm long.
When delivering asbestos please report to the weighbridge on arrival or see a member of staff on site as asbestos needs to be logged when brought onto site to monitor capacity. Your details will be recorded so what we can monitor frequency."
So this may be an option, depending on what is there. As for the canisters I can move the small ones myself but not the large one, I am hoping it still actually has some gas in it and then I may able to find someone to take it if they get the 'free gas'.