Brown sauce. I seem to buy a bottle every couple of weeks, but I don't go through it all that quickly. I guess sub consciously, the worst thing I can imagine happening is cooking up a delicious bap of slice and potato scone, and there being NO BROWN SAUCE. I'd rather not eat it all, thanks.
Current stocktake- 4 bottles in cupboard at home, 2 in my cupboard at work.

Also, Lea & perrins. I always seem to think I've run out of this. Current stocktake- 2 large bottlea and 2 small bottles.

Dishwasher tablets. My new flat doesn't have a dishwasher, and I have 2 boxes of d/w tabs which are free to a good home if anybody in Manchester wants to collect them.