Thanks to your help i have traced and sealed the leak to the forcabin on Saloma. It looks like another Bavaria fault which will occur on every boat if the method of construction is the same on the hull to deck joint. As the cable entry hole is over the anchor locker Bavaria have assumed, as i did, that any water entering would simply drip into the locker and out through the drain holes. unfortunately this is not the case. The hole for the cable is in the perfect position, adjacent to the inner edge of the toe rail , to collect all the water from forward of its position and rainwater running off the pullpit. The water then flows down the hole and back along the flimsy fiberglass shelf that holds the hardwood batten in place, immediatly below the hull to deck joint. I think that Bavaria introduced this small section of timber to offer some resistance and allow the self drilling screws to bite, so that the hull to deck joint could be pulled down tight. The water is entering the forward cabin between the underside of the hardwood and the top of the fiberglass that holds it in place.
Even on a boat that does not have a leak into the cabin, the hardwood in the anchor locker will remain wet and eventually suffer wet rot, particularly at the screw positions.
My advice to all Bavaria owners would be to check the navigation light cable entry inside the anchor locker and if the hole passes through the small timber section seal it from above.
If anyone wants details of the best way to do this please get in touch.

Thanks again to Hunros for pointing me in the right direction.