Metal detector find nr Morecambe Bay

Thanks Alan.

I was wondering if BL – breech loading as used on artillery. Paint colour is also more like Army than RAF grey/green or dark green. But the army never had a BL36.

I may be completely wrong but could it be a railway related item from a structure or signal post? Modern structure number plates are square and about 6-7 inches with identifying letters and either a unique number or mileage reference depending on what it is on. I don’t know what old plates looked like though.