March was a tough month for the NatWest (LSE: NWG) share price, plunging more than 15%. Barclays (LSE: BARC) did just as badly and Lloyds Banking Group (LSE: LLOY) wasn’t far behind.

There’s a positive though. All three are cheaper as a result, and yield more. Time to consider buying them?

Last month was tough for the FTSE 100 as a whole. The UK’s blue-chip index fell into correction territory, defined as a drop of more than 10%. There’s no way banks were going to escape the turmoil.

NatWest and Lloyds are heavily exposed to the UK, which offers little protection right now. The OECD has warned Britain could be the worst hit major economy. Barclays has a broader international…