Reddit reviews Laputa: Castle in the Sky

Yes, this https://www.amazon.co.jp/dp/B00005R5J4/ release lists English audio and it's the 1st DVD release in Japan of the film which predates the Disney one by a year so we know it can't be the newer dub since it hadn't been invented yet.

Yes this is what has made it hard to source. I have had a sudden realisation though and have spoken to my Best friend though and he is finding it for me in Japan. Hopefully he can and then he can send it for me.

For any future seekers this is the one https://www.amazon.co.jp/gp/product/B00005R5J4/ref=s9u_simh_gw_i1?ie=UTF8&pd_rd_i=B00005R5J4&pd_rd_r=ecc450c0-56b8-11e8-92ef-cf02451d2cf6&pd_rd_w=Vt0K8&pd_rd_wg=uyjVq&pf_rd_m=AN1VRQENFRJN5&pf_rd_s=&pf_rd_r=FMJ0CCKA5JFQTTNVTZV7&pf_rd_t=36701&pf_rd_p=7d4cee6a-0149-45bb-a2b2-9b4531af080e&pf_rd_i=desktop