Worrying, very worrying re London Mayoral election - could Ken still win?

The London Mayoral election results look worrying. Latest figurees that I have seen show the following:

Constituency	Registered	Scanned	Verified	Adjudication status
Barnet & Camden	100%	92%	87%	In Progress
Bexley & Bromley	100%	100%	100%	Complete
Brent & Harrow	92%	68%	61%	In Progress
City & East	100%	100%	100%	Complete
Croydon & Sutton	100%	100%	100%	Complete
Ealing & Hillingdon	100%	100%	100%	Complete
Enfield & Haringey	99%	79%	71%	In Progress
Greenwich & Lewisham	100%	100%	100%	Complete
Havering & Redbridge	100%	100%	100%	Complete
Lambeth & Southwark	100%	100%	100%	Complete
Merton & Wandsworth	100%	100%	100%	Complete
North East	98%	87%	87%	In Progress
South West	100%	100%	99%	In Progress
West Central	100%	100%	100%	Complete

The boroughs who have completed counting are mostly pro-Boris and those still with part to count are mostly pro-Ken. This could get very tight and a cynic might wonder if some boroughs are holding back to see what number of votes Ken needs in order to win. The turnout and postal ballot figures could be very interesting in the aftermath of this election.