Hi Sean,
I am a big advocate for woodchips, but only between the beds on paths. See my last post on ‘reconceptualising no-dig gardening…’
I had a hunt through the RHS pages and they tell us that ‘The RHS do, however, recommend that basal parts of trees infected with honey fungus, Phytophthora root rot, or parts of trees infected with stem diseases such as verticillium wilt or coral spot, are not used, to reduce the risk to plants.‘
Notice it the quote that it is only basal parts of the tree donating the chippings they are talking about. Unless you are really unlucky and the tree surgeon has been doing stump grinding, I thinky you would be very unlikely to have problems. To my mind, the spores for honey fungus and the like are constantly about us, and if they deign to take hold on your plot,(as they did for fzjohnson) then they will.
As a by the way, my treesurgeon delivered a lorryload of bay tree leaf and branch chippings which had been on the back of his truck over the weekend. When he tipped it out, the temperature was already up to above blood heat, showing how quickly it had started to rot. It smelt divine too!