As far as I can make out, TTP Comm, has moved from the AllShare(Small Cap) to the Fledgeling index:
See:
For detail see:
FTSE Small Cap FTSE SmallCap
Comprised of companies with the smallest capitalisation of the capital and industry segments. Represents approximately 2% of the UK market capitalisation.
FTSE Fledgling The FTSE Fledgling consists of all UK companies which qualify for inclusion in UK Index Series but are too small to be included in the FTSE All-Share Index. Companies whose full market capitalisation is greater than 0.2% of the full market capitalisation of the FTSE SmallCap will be added to that index, providing they meet the liquidity criteria for the FTSE All-Share Index.