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Sponsor
I don't think those are tradeable via IB. If you load the symbol (GB) hit enter and choose bonds, if you look under the tradeable column in the contract selection window, it says "no" - at least it does for my setup. If you hover over the red info dot, the reason provided is "Transfers Limited: European Union Related Contract Redeemed Bond". I'll check why that restriction is in place with our bond team and why it prevents us from offering to clients.