I investigated a fire on a boat in Watford this morning, I will not bore you with with too many details, smoke alarm woke up owner in the night, found smoke coming from cupboard under sink, called fire brigade, fire not that bad but the cause is more alarming. A old fly spray aerosol had dropped down the back of the shelf and rolled under the plinth. It had been there a long while as the corrosion in the casing caused a pin hole that then released a quantity of the propellant, (in this case propane) this flooded the void which was next to the gas fridge, this caused a flash back and ignited the rest of the contents which resulted in a fire below the cupboard floor, this flame (blow lamp style) started to melt 16mm electric cables which also went to the fridge. Luckiley a neighbour put out the fire before too much damage was done. Morals! fit a smoke alarm and watch those wasp/fly sprays.