Headlights HELP!

Hi all, help needed again! Had a problem with headlights last year, they would switch on some days and not others, some days you would be driving and they would go off, then it went back to normal until last month and it started again, fitted a new on/off switch and also put a new dip/high beam switch, this did not cure it, then all went back to normal again. Monday it all went tits up again, only this time I can only get side lights and full beam if I pull the dip switch to flash. Having read all the threads on this problem it seems that it's the relay behind the clocks, how do I get at it? never had the clocks out before, also what's the part No so I can get one ordered off the net so I can get mobile again. I would be over the moon (my only headlight at the moment) if anyone can give me any ideas what it could be!
Thanks all Russ.

I had the same problem on the way to France. side light and flash only. Turned out the light relay behind the binical has gone. I bypassed the earth to get me on the road again, works fine, but then don't have flash. Just got home and fitted new relay... problem sorted

Part number; YWC10050

forget taking the clocks out.... take the speaker out instead

also... mine was full of water as it had come off the metal bracket and ended upside down, striped washed and dryed it and works fine

had the same prob & changed the on off switch & didn't cure it so then I swapped the indicator stalk which the wiring had broke up & that cured it

Think it's the relay so will try that first, thanks for the help.