Found these:
http://www.brfares.com/#!fares?orig=BLY&dest=LNE
Given that I hold a print at home Eurostar ticket how can I buy them (if at all)?
What are the restrictions on the High Saver?
A special set of fares exist between some 130+ UK towns & cities and a special destination called London Eurostar CIV. These are the special fares Eurostar adds to its own fares to sell its through tickets, and they are usually the cheapest way to add a UK train journey to your Eurostar booking. Fares to London Eurostar CIV are usually cheaper than the equivalent fare to London International CIV.
Unfortunately you can no longer buy these fares separately, as Eurostar closed its domestic travel office at Ashford in July 2016.
Found these:
http://www.brfares.com/#!fares?orig=BLY&dest=LNE
Given that I hold a print at home Eurostar ticket how can I buy them (if at all)?
What are the restrictions on the High Saver?