This is what I did - it didn't go exactly to plan.
It's definitely reminiscent of Tia but not quite there. Maybe a bit more vanilla would help, but getting the ABV up would help more. I'll definitely use a high tolerance yeast next time. It has a slightly oily texture (like Sarah Hugh's Dark Ruby) which I dislike in ale but find OK in wine at this ABV: higher ABV would help with that too.
Despite my distrust of the hydrometer readings, having had a (small) bottle to myself one day I suspect it is in fact about 13%. If it could be made to 18 or more with a different yeast (I have some Gervin 4 on hand for the next try) it would be far better - but it does want to finish sweet, for my taste.
2012-05-19
2lb sugar dissolved in warmed water; 4Tbsp instant coffee added; Cooled a bit while yeast rehydrates
Into demi with 1tsp citric, 1tsp nutrient [NB CJJB recipe says 1tBsp citric, not sure now what I actually did]
Plenty of headspace left for later feeding; Pitched yeast (Gervin D)
2012-05-24 Added 1/2lb sugar dissolved in 1/2l warmed water
2012-06-03 Added 1/2lb sugar dissolved in warmed water
2012-06-11 Added 1/4lb sugar dissolved in 1/4l warmed water
2012-07-07 Removed 250ml and added 4oz sugar in 250ml water.
According to hydrometer was about 12.5% - Dilution reduces to about 11.8%
2012-08-10 1.034
2012-08-22 1.032 (not much drop... temperature correction? really that slow?)
Still very sweet, "strangely moreish"
2012-09-13 Trying to clear and trying to bubble the wrong way, so racked and stabilised.
Added a few drops vanilla. Tastes pretty good! Not too far off Tia Maria. Quite sweet, quite strong.
2012-10-21 Hydrometer now claims only 13%, I reckon it's more.
Seem to have got the vanilla about right, and it's sweet but not too much. Rather nice in fact.
As soon as I have the spare time I'll bottle it: maybe Thursday, possibly tomorrow.
2012-10-27 Bottled. More sorbate&sulphite, JIC. Very tasty.