Met Police assistant commissioner Mark Rowley said:
Just to be clear, we are focused on the appeal on Crimewatch next week which we hope will produce new witnesses. It is clearly too early to speculate about where this will lead.
It remains vital for us, and the success of the appeal, that the public are focused on new facts that can be released by the investigative team rather than speculation.
I am impressed by what Detective Chief Inspector Redwood and his team have achieved but a conclusion is not imminent, there is much ground to cover and we still need assistance - hence the appeal next week.
More top news
Berlinah Wallace was convicted of throwing a corrosive substance with intent but acquitted of murder.
The Duke and Duchess of Sussex will attend a Buckingham Palace garden party as part of the Prince of Wales’s 70th birthday celebrations.
Official photos from the royal wedding are used across many of the papers.