_,,,^..^,,,_ said:

By the way, EP6 on the PAL UK laserdisc boxset is the extended version, and include a prologue by Leonard Nimoy... IIRC the latter was not available on BD, right?

I quote myself (!) because I wrongly wrote that the prologue by Leonard Nimoy was included in EP6, while it was before EP4; plus, EP4 PAL laserdisc has also a four-minute so called "european prologue", that could be not available in US editions (I need confirmation about it); if it's true, then EP4 and EP6 on (PAL) laserdiscs are different from the blu-ray editions, and (may) worth a restoration...