Update - I've just decanted the sloe gin through a coffee filter (and it took ages....) into the original bottle, with a wee taster glass and 3/4 of a hip flask for my troubles.
I'm wondering if I should have left it for longer, but almost three months seems to have worked well.
The problem is that, although the stuff tastes far far better than the original gin (I'm Scottish, and a confirmed Scotch Malt Whisky drinker from age 17), I'm not massively sure I like it....might just make sloe schapps/vodka this autumn.
Ho hum