Many people are struggling with the single bubble concept. It can be tough on those leaving alone having to pick one household to bubble up with and then relying on that household not to have anyone else added to the bubble. If you have elderly parents yourself and are sandwiched between adult children and grandchildren, plus close friends you would like to see, the choice is often too difficult on terms of strict compliance.
Nearly everyone I know seems to have some overlapping going on, but otherwise socialising is markedly reduced, which is the underlying aim to reduce the risk of spreading the illness in an uncontrolled way..
If OP is worried then then maybe the safest option is to practice social distancing with anyone outside own household, seeing other people outside and staying 2m away, and dropping off shopping etc on doorsteps. Everyone must do their own risk assessment and mitigate accordingly.
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