I think you can afford to relax a little. We live in northern Scotland, and it actually is quite rare to come back from a walk in the hills and for one of the family not to discover a tick somewhere on them, usually because they start to itch and come up red around them (just localised erythema, not the bullseye rash of Lyme). Particularly the kids, because they're more often crawling around on the ground, but any of us really. Remove it with a tick card, maybe put a dab of TCP or suchlike on the spot if you like, and carry on - in my experience you're very unlikely to have a problem - particularly if you catch them early and small, like the one in your photograph, which is what the ones we're removing invariably seem to look like.