Damien worked a total of 40 hours last week.
He worked 16 of these hours at the weekend.
His colleague, Fred, got paid £400 last week.
How much more did Fred get paid than Damien?
Damien worked 40 - 16 = <<40-16=24>>24 hours on weekdays.
Fred earned £400/40 hours = £<<400/40=10>>10 per hour.
Fred earned £10/hour x 40 hours = £<<10*40=400>>400 in total.
So Fred earned £400 - £10/hour x 24 hours = £<<400-(10*24)=160>>160 more than Damien. Answer: \boxed{160}.