Mellotronists

I was listening to Moving Waves yesterday for the first time in ages and 
I noticed that Thijs van Leer used Mellotron strings in quite a few 
songs as well as what sounded like to me trumpets in a section of 
Eruption.Am I correct?I looked on Andy's page and he didn't mention 
Focus.Did Thijs own one or borrow from a studio?
Pete