My records show OG 1.047ish and FG 1.011ish (at 19 litres).
And I agree with Pirate_Pete, they can be drunk after about a month or even earlier.
Thanks terrym I'm gonna be having a go at this probably weekend. I notice your recipe says 500g of golden syrup but I can only find 454g tins. Would this make much difference and if so could I add some brewing sugar to make up the difference?