As I understand it, Direct Market Access for shares with IG does not allow me to place orders directly onto the London Stock Exchange electronic order books. Instead with IG, I would actually be buying (assuming I qualify as a 'Professional client' and am granted DMA) a CFD based on the underlying price of the share itself. Therefore I would not be able to use DMA in a stocks & shares self-select ISA (though I would be able to see the Level 2 price data if I paid the L2 data fee) because CFD