They're home

We got about a third of our new allotment annexe cleared last weekend and planted it up the calabrese and cauliflowers. The remainder had the grass hacked off and left. We both went down this morning (to collect courgettes, natch) and the grass strimmings had all been burnt. Now, the question is was this a bush fire (maybe sparked by a bit of glass making a lens onto the tinder-dry grass) or did the Allotment uber Gaffer decide to make the clearance a bit easier for us?