Tomorrow, I am arriving into T3 with Finnair ( first time on the A350 :-) ) at 9am. My onward connecting domestic flight, out of T5, is at 6:55pm.
My colleague arrives into T5 around the same time and connects onward (domestically) at the same time as me. We will both have hand luggage (carry-on + laptop bag).

We both have appointments at the US Embassy for Global Entry interviews in the early afternoon and we are not allowed to take anything into the building and there is no storage there either. Our appointments are at the same time, so we both have the same issue. In retrospect, we should have staggered our appointments and each could look after the other's bag - duh!

So, looking for suggestions for storing our bags.
1st option - go to T5 Flounge and could we leave our bags there - if so, can we go land side OK and then would we have any issues getting back airside and into the lounge?
2nd option - leave the bags at a storage area in e.g. Paddington, as we will likely take the HEX there?
Any other option or opinion?

Thanks in advance!
Geemac