There is a message on the webpage for Taxtalk indicating that they filed for voluntary liquidation on 25th September.

We're aware that they had the rump of a fighting fund supporting them for a long while but that has obviously now been exhausted.

The schemes they were looking after are arguably close to the Boyle/Sandfield situation although Taxtalk spoke with a QC who found a fair number of distinguishing features and I think I'd agree with most of them. Unfortunately the differences may not be enough to take a Court action (depends on your attitude to risk) but I think are enough to make a decent argument.

If you were in any of the schemes being looked after there AND you have not elected to settle, you should get some advice.