No, it's not the neighbourhood, with the group of local itinerant teenagers sometimes breaking in to the block to smoke cannabis and intimidate the residents.
It's not even the slightly infrequent overground train service which only runs every half hour on a Sunday which is getting me down.
No, no, it's more of a fundamental requirement which is bugging me - Water.
I should be grateful really, that I live in a country which provides 24 hour access to the most important element in drinkable form. And I am. I am eternally thankful for this sustaining source of life being piped in to the house. No, truly. It's a blessing. Thank You God that I shall never go thirsty.
But hey, God, now that you are on the line, could I ask just a teensy favour? Could you warm it up a bit and bring it through the taps a tiny bit faster, so that I can have a hot bath at some point today, preferably before I have to leave the house at 5?
The flat I live in is on the 4th floor. The day after I moved in, the water pressure coming through the bath taps and the shower dropped significantly enough to trick the boiler in to thinking that nothing was coming through.
Now, call me spoiled if you wish, but I do love a hot shower. Standing under a dribble of tepid water is not enough to set me up for the day. My landlady is practical and philosophical - a tepid shower is not so bad - it's tolerable.
No, no, no. It's not tolerable - it's insufferable! I don't wake up in the morning until my skin is a bright shade of pink all over!
Being of swift mind, I soon discovered a neat little trick: if I turn on the hot tap at the sink and turn it down to a trickle once the hot water starts coming through, the boiler stays on and the dribble of water trying to pass itself off as a shower comes through passably warm. Sometimes it even steams up the mirrors.
Today, being delightfully filled with snot and feeling groggy, I decided that it would be a real tonic to have a good soak instead. After 'running' the bath for half an hour and writing most of this blog post in the meantime, I returned to the bathroom to find 2 inches of water which still didn't really fit my description of 'hot'.
Oh well. As a good friend once said: "Persistence narrows the odds"
As would a good plumber.