FYI, HSA were not much assistance. Whilst any "competent person" can remove the roof, I could (in theory) be asked for a method statement, etc, detailing how the work is to be carried out.
Its clear to me that disposal takes place here in Ireland (there is one Kildare facility that accepts it), despite the fact that two of the guys looking for 1000 euro told me that it needs to be sent to Germany. It just seems like the small number of contractors are making the most of the specialist nature of the work and keeping prices on the (very) high side for the labour involved.
Whilst I will use one of these and do the job properly, it just makes me wonder how many people will just decide to do the job themselves and dispose of this material in a bog/quarry somewhere.