If a copy still exists in the UK, they would probably have a copy at the BA Heritage Centre or they may know more about it. [The heritage centre is basically the archives of BA and the predecessor airlines which is located at Waterside] If you delve around on the BA website there is a contact email address. Be aware the centre has been closed for months now because of COVID [and is still closed] as the centre is manned by volunteer retired ex-BA staff. They do still answer emails though and may have some details.