I have yet to see any logical explanation on a man and a woman being seen at the time Suzy had wrote down she would be showing a property.
We don't know that a man and a woman
were seen at the time she would be there. What we have is three mutually exclusive accounts from HR, whereby he saw:
1. an unidentified woman and a slim well-dressed man aged 25 to 30 coming out of 37SR at 1pm;
2. the man bundling the woman into a vehicle at 1pm;
3. an unidentified woman and a podgy nondescript man aged 40 to 45 coming out of 37SR at 1pm.
The podgy nondescript bloke of 40 to 45 is the diamond dealer he later said was a dead ringer for Mr Kipper. Sources do not indicate whether the police challenged this major change to his account. If his view was so poor or brief that he couldn't even tell the man's age, of what value was his account?
HR asserted all three. You can't insist on any of the three being correct without also conceding that the other two must be false. "Mr Kipper" was either late 20s or mid-40s, but not both. He either bundled the woman into a vehicle, or he did not. In fact, all three could be false - there was no evidence of SJL inside 37SR, even though HR claimed to have seen the couple leaving.
So, on the basis that most of HR's evidence is inaccurate, with two-thirds of his claims clearly wrong, it's not a huge jump to suggest that what he actually saw was
4. an unidentified woman and a slim well-dressed man aged 25 to 30
failing to enter 37 SR at 4pm.
For this to have been Stephanie Flower and Mark Gurdon, the only error HR would need to have made would be to get the time wrong. Otherwise it's spot-on as a description. And if he got so much else wrong, there's no reason he couldn't have got the time wrong.
The difference between his 1 and my 4 is far less than the difference between his 1 and his 2, or his 1 and his 3. On the basis that it's the least erroneous account, I prefer 4 as a description of what HR actually saw.