This turned out beautifully! It's on Tenina's site
hereand also a modified version is in this year's calendar.
The recipe is for a 13cm spring form tin. I have one double that size, so I doubled the recipe and it worked really well. The only thing I added differently was Cadbury's Turkish Delight because I can't buy normal Turkish Delight anywhere here and I also didn't have any rosewater. Oh, I did add a bit of soft butter to the shortbread. I used Arnotts Scotch Shortbread.
Also, I didn't double the sugar, but used 100g.
It must have been nice because DH had two helpings! I had a mouthful to try it, but I'm not really into desserts. It had a lovely texture and wasn't too sweet.
This is definitely one I'll use for dinner parties.