The Invasion Has Begun

Has anyone else noticed a proliferation of ladybirds?

I thought they were really rare. Few years back whole Summers passed without a glimpse; now my garden is full of them. Good for the roses I believe. Also believe there are good British ones and bad foreign ones. Ive seen the yellow ones and the ones with too many dots on them but these look like the 'classic' type. They are on pretty much every surface I look at, not just greenery but pots, garden furniture, the concrete path, windows, you name it.

This was just one of many clusters of them. They are indoors too. Should I be worried?