I find this link to be more useful as it gives the big warning about MCTs only applying if luggage is checked through

Connection times: important information

Pages within this section may quote minimum connection times. These only apply if you have booked a through-ticket with an airline or travel agent, and any baggage is checked through to your final destination.

Minimum connection times do not apply if:

* You have arranged your own flight connection; or
* You need to pick up baggage at Heathrow

In these cases you will need to follow signs for arrivals, then check in as normal for your connecting flight. You should allow extra time for your journey. If you need to change terminals, please visit our between terminals page.