あらまあ、、

なんと、そんなことになっていたのですね。

LHRのサイトにも、別切りはこの乗り換え時間が
適応されないから注意せよとはあったのですが、
やはりトラブルが多いのでしょう。

ワンワールドはこれまで、提携はかなりしっかりしていたので、
BAへの受け渡しも問題ないと思っていました。
この文を読むと、CXとの関係は特別なのですね。

QRのビジネスクラスから優先レーンが使えるでしょうから、
少しは（実はかなり）時間短縮になるでしょうが、
入国と荷物回収があるとなると、危ないかな（やはり、
相手はヒースローなので）？と思ってしまいます。

こういうことのようです

JORGEさん、おひさしぶりです。
お元気そうで何よりです。

通常の方法でチケット購入している顧客を優遇しないわけにいかないということでしょうか。

長いので先のレスに貼り付けませんでしたがこういうことのようです。ＢＡのサイトから。

Changes to Accepting Customers with Separate Tickets
Summary of Changes

From 1 June 2016, the oneworld policy on accepting customers travelling on separate tickets was changed.
BA, along with our oneworld partners, has implemented this change in policy which is as follows:

Only those customers that have separate tickets issued in the same PNR/booking will be accepted for
through check-in.

How to handle customers with separate tickets in different PNRs
Customers that have separate tickets issued in separate PNRs/bookings will not be accepted for through
check-in, regardless of which carriers they are connecting on to, including BA or any oneworld partner.
These customers, and their baggage, will only be checked in to the destination showing in the system. No
on carriage details are to be added into the check-in system at any stage.
Please note that where a customer has separate tickets, the Most Generous Allowance (MGA) rule for
baggage does not apply and any excess baggage will apply as per the ticketed sector for that ticket.

What it means for BA and the customer
This change means that the originating carrier is not liable for any rebooking and additional costs incurred
as a result of disruption, for flights on other PNR/bookings.
Customers who have booked a through ticket will continue to receive the full benefits including through
checked bags, MGA and full assistance should their journey be disrupted.

(中略－表)

Changes to Accepting Customers with Separate Tickets

FAQ’s
1. When does the new policy take effect?
The oneworld obligation changed on 1 June 2016 and BA has implemented this change from this date.
2. Why are we making these changes?
Legally speaking, two separate tickets have two separate contracts. Therefore BA is only responsible for
carrying baggage to the destination specified on each separate ticket.
3. So why did oneworld originally offer through check-in even if customers were using separate
tickets?
This policy was brought in when airlines were changing from paper to electronic tickets, around 10 years
ago to ease technical limitations and processes for the customer.
4. At check-in, what information should we give to customers travelling on separate tickets in
separate bookings/PNRs?
Unfortunately for customers who are used to interlining on separate PNRs, BA and other oneworld
member airlines have no obligation to provide any services or benefits beyond those specified in the
traveller’s ticket.
5. How should we manage customers on separate tickets that have missed their second flight due to
disruption?
We will continue to assist customers in rebooking their journey. However, customers will be subject to
the terms and condition of the tickets and there may be additional costs associated to the ticket changes
based on the fare rules. BA is not liable for any duty of care costs.

日頃JORGEさんが厳しく言っておられることが明文化されたに過ぎないということでしょうね。

優先レーン

JORGEさん、いつも明快なご回答ありがとうございます。

＞ QRのビジネスクラスから優先レーンが使えるでしょうから、
＞ 少しは（実はかなり）時間短縮になるでしょうが、

とのことですが、今回初めて（あるいはものすごく久しぶりに、こちらBA専用ターミナルだった時期がありますか？）ターミナル4を利用します。優先レーンからの入国は具体的にどんな感じになりましょうか？ターミナル5までの移動はやはり鉄道の方がいいでしょうか？ご教示いただけましたら幸いです。