Our other car is having a dent repaired so the Marlin is our only vehicle....

So yesterday the ball fell off the ballcock in the header tank in the loft (There must be a joke in there somewhere). So I needed to get a replacement. Usually I go to Screwfix about 6 miles away, but would the Marlin start. Nope, engine turned over but no sign of life. So I walked 2 miles to a more expensive builders merchant and purchased a new ball and ballcock, fitted it then went in the garage and the car fired up immediately.

Today I got in the Marlin to go to the Henstridge 5km Parkrun. Didn't start again, so I went for a run from home. Got back, then went in the garage and the car fired up immediately.

Is it playing jokes on me?