with thanks to AnnieW55 .
Went out today with intention of trying out 'back stitching' as a means of tackling steeper inclines so returned to the hill that so took it out of me on Sunday.
Despite essentially meaning you double back on yourself it really did help in getting up the hill without feeling so knackered. And (Though admittedly less humid today) the run home then felt much better to.
Was also helped by this video I came across - with a similar exercise (though preferred Annie's as at least then you end up at the top of the hill!):
which helped remind me to keep upright and kind of use shorter trot-like steps.
Weirdly enjoyed it and think will mix it in, in place of intervals, some days.
Great tip - thanks.