I understand, I also live there and suicide certainly is especially difficult and limited for us. The UK is such a pro suffering country, with the common attitude being that life must be prolonged rather than being seen as a choice. I also feel trapped here and I do get that it's certainly awful and tiring when you wish to be gone yet you feel stuck here. We really shouldn't have to struggle so much to set ourselves free from a life that we never asked for, as after all continuing to exist is just delaying the inevitable anyway. So therefore it literally makes no sense to make suicide this difficult as to die is such a normal thing which is to be expected.
But I guess that all that anyone can do with methods is to do their own research, sadly there are no easy answers to this, if there was I would already be gone. But, yes the world we live in is the true hellish nightmare, I really despise existing and of course I envy those who have managed to succeed with ctb.