Strategy for repatriating

Hi
We are planning to repatriate to the UK after 20 years in Belgium. To make it easier, we are planning to stagger the move. Meaning I would move first, get a job, and set things up in a rented property. The family would follow a few months later. If we sold our Belgian home at the moment my family move but after I move, what would be the impact on capital gains tax ? I checked the gov.uk website, but I can't find info for this specific scenario. By the way, the house is jointly owned. If this requires professional tax advise, can anyone recommend an independent adviser. Thanks!