Had a reply from Bosch. I asked whether this filter would be adequate to use in dusty desert conditions, bearing in mind that the OEM oil filter has 2 filter elements. This is the response I got:
With regards to your question about an oil filter for your Toyota land cruiser. All Bosch oil filters are single element type but still suitable for your application. As you are using your vehicle in extreme conditions it may be wise to use the OE filter.
So I'm convinced, if I don't take it to the desert I will be using Bosch oil filters, however if I do I will use Toyota filters.