ArthurMann
Hello. Does anyone know any good places to take my grandkids to this autumn in the UK? They will love anything. 
Make a scarecrow or even guy for the garden, build a small fire and toast mashmallows etc, build a bug hotel, make bird feeders, build dens from branches /sticks in the woods etc.. Invest in a magnet fishing set (godsend with my GC) spend hours finding treasure (bottle tops etc lol) make boats play pooh sticks (if local stream) aeroplanes /kite flying (B&Ms have cheap planes £2.99)conker collecting /playing, bark rubbing, chalks on patio, water painting /drawing on the walls, make moon dough, playdough, slime, invest in a cheap tent in the garden, junk modelling, big boxes to decorate made into trains/cars/planes, (hobby craft sell cardboard castles/house etc to decorate etc etc etc