Hello,
Assuming the weather is only slightly damp, we'll go ahead for Sunday 26th March.
Meeting point, outside Farringdon Station at 10:00 AM:
To get here from Orpington, you can take a South eastern train from Orpington to London Bridge, then change to Thameslink for 3 stops to Farringdon. You have to exit the rail station and cross the street to get to Elizabeth line, so we'll meet on the street:

We'll start the day at Farringdon Elizabeth line station. When ready, we'll proceed to Bond Street. There more phots, before the station gets too busy. The West end shops open at 11am, so it gives us some time to compose our shots.
After this, no rush, perhaps back to Liverpool street, then surface for some lunch?
Spitalfields, Truman brewery or even Brick lane are not too far.
After lunch, open to ideas, if you want to head home, you have many options.
One suggestion, head to Custom house, you can then, once exiting the station, take some photos in the Royal Victoria docks, where I took these images previously:
