Central Heating doom redux

Just about to go away for the Christmas Holidays and Wife points to puddles of water below boiler (furnace for non Brits). Since this is next to the loo I get ready to tackle the issue of pointing with number one son. He is however blameless.When not heating water or the house a steady drip every 20 secs or so is emerging from the wall mounted boiler. Nothing I could do about it there and then so I put a bowl underneath and hoped for best. On return no disaster but I have to do something. Rather than dissasemble it and risk no heating over the new year period I gamble 8 quid on some screwfix brand no nonsense leak stop and throw it into the header tank for the system. Bottle claims a fix within 24 hours. Yeah right! 3 days of contemplating the horrific cost of a boiler replacement and then suddenly, praise the lord, all is well. Drip has stopped.It is going to be a happy new year after all!