I have a jasmine plant growing outdoors in a sunny well drained spot. It is
aprox 2 to 3 metres tall and I have trained it round a rose arch.

Today I noticed that some leaves are turning brown from the outside of the
leaf towards the inside. This seems to be gradually happening from the lower
leaves upwards.

Could it be that this is simply due to lack of water, or some other cause?
It has been quite dry (and warm) here in London recently.

RW.