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* FTSE 100 down 0.4%, FTSE 250 flat
* HSBC falls after profit miss
* Brexit uncertainties drag on
Oct 28 (Reuters) - A sell-off in financial stocks following an underwhelming earnings update from HSBC kept UK shares in the negative territory on Monday, while confusion around a potential delay to Brexit and a snap election lingered.
The bluechips were 0.4% lower by 0806 GMT, with HSBC responsible for more than half of the index's fall, while the FTSE 250 was largely unchanged.
HSBC slumped 3%, heading for its worst day in eight months, as its third-quarter profit missed market expectations amid ongoing macro-economic uncertainties including the Sino-U.S. trade war, Brexit and the Hong Kong protests. (Reporting by Muvija M and Shashwat Awasthi in Bengaluru; Editing by Shounak Dasgupta)