memyself, you may not have said Britain should feel shame, but the thread title does.
Rapaire, so although Britain did more than any other country to fight slavery, it still gets it in the neck for not doing even more?

Britain's shame is that some of its merchants joined the pre existing trade for a while.
Its pride is that it abandoned the lucrative trade on purely moral grounds and used all means possible to stop the Atlantic trade, with no help from any other nation.