Thanks for the responses thus far.
I spent a few hours yesterday ringing around and managed to cut my monthly bills and direct debits down to around £650 (including my share of the rent and council tax). The gas/electric stood out; the DD's gone down to £43 PCM and I've asked for a sizeable chunk of the £hundreds in credit that has accrued since we moved in last August to be refunded to my account.
I note that Tesco accounted for £91.07 this month. Not awful, but she probably matches that. What are peoples' thoughts on more effective grocery shopping? We tend to cook from scratch and we're good at not hoarding tins and random packets; for example, I know that all we have in the freezer is spinach, peas, and half a pack of chicken thigh fillets. I suppose that a bottle or two of wine each week makes a difference and that may have to go. Unfortunately there's only a small Tesco store in town; Lidl, Aldi, Asda etc would be a 40 minute round car trip. There is a ludicrously expensive farm shop not too far away and a butcher but no greengrocers etc. Perhaps meal plans and online shopping are the answer.
Eating out was £159.81 - an easy (ish) one to solve and a notable saving. I've included food bought during lunch breaks at work in that figure.
Car costs were £613.51 (over two-thirds of that were cambelt, water pump, service & MOT). This was a big cost this month. One to ponder for the future but, since we both work 25 miles in opposite directions from where we live, motoring is currently an expensive fact and not a choice.