1 Before you start, it's sensible to check that you did actually buy all the ingredients when you went shopping with this recipe in mind - it'll save having to race up to the little Tesco to buy missing items.
2 It's worth listening to your own advice about storing onions, so you don't have to fish through a cardboard box (kept in the mini-greenhouse) of increasing mouldy specimens to find the required amount, leaving half a dozen small relatively sound ones as the remainder of this year's entire crop.
3 If you don't keep an eye on the food processor you run the risk of liquidising, not chopping the onions.
4 Don't assume that just because the salad box in the fridge is full of runner beans, you have enough.
5 Do think about alternative ways to string & slice runner beans - the current gadget cannot cope with beans with are too thin, too fat, or variable in thickness; beans which are too soft, or beans which are too old.
6 When the beans are cooking for 5 mins in salted water, and the onions are softening in the big maslin pan with some vinegar, do check that the correct knobs on the cooker are turned to high for the beans & low for the onions - Delia doesn't say what to do if the onion isn't 'softened' but 'burned to the bottom of the pan', but I took an educated guess and sloshed in a load more vinegar on the basis that you either won't taste crispy onion, or it might add a certain je ne sais quoi to the end product.
7 Do check that you have enough kilner jars before you start.
8 If the pickle looks a bit thick when you put it into jars, don't shrug & slosh some more vinegar in, but check the recipe to make sure that you haven't forgotten a vital ingredient, like, for example, the sugar.
9 Having to return the pickle to the pan with the sugar does give you time to find & sterilise more jars
10 Although a new extractor fan will make light work of transferring vinegar smells from the kitchen to outside, it will not stop you wondering why the chippy is open at this time of night every time you go outside the back door.