I don't see anything obviously wrong with your soldering. Since you are in the UK, you'll need to solder the PAL jumper as described in step 3 (unless you are sure that your TV can handle an NTSC signal). I don't think this is your problem though, because you'd get sound and you'd be able to program the chip using the FTDI cable.
I would use your multimeter and make sure you have 5V across the VCC and GND pins on the ATmega chip. The datasheet here shows which pins to check (7 is VCC, 8 is GND, 22 is GND). http://www.atmel.com/dyn/resources/prod_documents/8271S.pdf
Some of your solder joints look a little light on solder, especially the FTDI cable connector. You might want to reheat/resolder some of your joints just to make sure they are good.
Also, I have to ask if you had the FTDI cable oriented correctly when connected -- forgive me if that's an elementary question.