What is Article 50 of the Lisbon Treaty – and will it be delayed by the House of Lords?

Peers are due to debate UK's draft law on triggering process to leave EU

Peers in House of Lords
There are around 800 life peers, hereditary peers and religious leaders in Parliament’s upper chamber

Triggering Article 50 of the Lisbon Treaty will formally begin the UK's withdrawal from the European Union – but it has never before been used and is completely untested.

So what does it actually involve and could it be delayed in the House of Lords?

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