I want to punch myself in the head - hard.

I have been without TV for a week, ever since we had a blizzard and I lost my signal. I tried to reprogramme my Humax Freesat Box myself and could not get past the page which asked for my post code (to find out which region's news I wanted). I put in the UK post code I have always used, but it kept telling me it was invalid. The engineer finally came out today, put in the post code without the space between the two sets of letters and - hey presto, I had all my channels back. It did tell me to use a space, honestly, but if I had tried it without I could have saved myself €60. It took him about ten minutes, but he had an hour's return travelling time.
I suppose I should be relieved because I thought he would need to go on the roof and do something to the satellite dish, but I just want to kick myself. (No volunteers, please!) [anger]