Daquilo que me apercebo os serviços electronicos no UK para a LSE dividem-se em 3.
SETS is the London Stock Exchange’s flagship electronic order book, trading FTSE100, FTSE250, FTSE Small Cap Index constituents, Exchange Traded Funds, Exchange Trading Products as well as other liquid AIM, Irish and London Standard listed securities. The Exchange also operates a version of SETS on a modified trading cycle that supports Securitised Derivatives. Functionally rich with multiple order types, market maker support all the way up the book, SETS is one of the most liquid electronic order books in Europe. It is this liquidity, underpinned by a rigorous rulebook and market supervision, coupled with the widest stock coverage, that attracts so many participants creating unrivalled opportunity to do business. Market participants can choose from 2 competing clearers ensuring anonymous pre and post trading, along with full counterparty protection.
SETSqx (Stock Exchange Electronic Trading Service – quotes and crosses) is specifically designed for securities less liquid than those traded on SETS. SETSqx combines four periodic electronic auctions each day with standalone non-electronic quote-driven market making providing guaranteed liquidity in at least one Exchange Market Size (EMS). Currently, all market participants with order book access can enter electronic orders which will be immediately displayed to the whole market for the next scheduled auction. As of June 2014, there are 1,065 securities on the SETSqx trading service.
SEAQ is London Stock Exchange's non-electronically executable quotation service that allows market makers to quote prices in AIM securities (not traded on SETS or SETSqx) as well as a number of fixed interest securities.
Em todo o caso, vou enviar um email à LSE a ver se me conseguem elucidar melhor.