Enough time for revivals visit?

I will be arriving on a Sunday morning from JNB at 06:20 and departing on a BA domestic flight at 08:50 from terminal 5. Provided there are no delays, would the experienced of you say that this would be enough time to exit, use revivals and make my flight from T5 landside? I only really want to have a shower before the day ahead so would not need much time once there.

You would have to hit BA conformance by 35 mins before departure so that eats into your 2 1/2 hours.

Heathrow website says average journey time using the HEX is 20 minutes.

Depends on how long it takes you to clear UK immigration and that time of day is when plane arrivals ramp up.

It's doable but tight.

I assume you don't have lounge access via BA as it would then be the much quicker airside transit route.

This will be your visit :-

If the JNB flight's on time, you don't encounter delays at immigration and you've no baggage to reclaim at T3 you should get 30-45 minutes in Revivals.

There's a train at 0747 which would give you plenty of time to clear conformance at T5 and make the domestic flight.

If your luggage isn't checked through to your final destination and you have to reclaim it at T3 and recheck it at T5 then you can probably forget any Revivals time.

Not sure I'll chance it. Will see how things are working on the day. I thought I had BA lounge access as booked in Business but apparently I'm booked in a 'D' fare bucket which isn't Business UK. I'm sure that's obvious to some people but wasn't to me!

Love the Simpsons graphic!