This should be quite simple.
If the EU don't give us full access to Galileo we deduct the billion we have invested from the £39 billion divorce bill and deny them use of places like the Falklands, Ascension, Diego Garcia and Pitcairn for the necessary base stations.
IMO we won't be paying any divorce bill as the EU will not have even agreed to have any meaningful trade talks by March 2019. The French are the main sh*t stirrers on Galileo and if it ends up being adjudicated on in the International courts then so be it. Where GPS is by far the oldest system it is easily overlaid to give incorrect results like it does around critical Russian areas like The Kremlin and also easily jammed which is of a concern where so many NATO standoff weapons rely on the military version for a few metres or better CEP accuracy.
David Davis let slip yesterday that the UK no deal plans with us relying on WTO tariffs and trade rules are well advanced.
The biggest blow to Europe if they decide to play hardball are in finance where over £1tn of loans to European industry has been raised and are administered from London and our withdrawal from Europe's defence, intelligence and security systems. Although our defences have been eviscerated since 1991, so have most defence budgets in Europe many like Germany, Netherland, Italy & Spain, much more than ours and our forces still have reasonable engineering, logistic and transport unit unlike many European armies where these are always low hanging fruit ripe for cutting, if they even existed in the first place.
Putin has stated the worst day in his live, which happened while he was posed in East Germany, was the disintegration of the Soviet Union. He maybe trying to recreate it, from a position of massive economic weakness, but overall it is not going very well, with only wins in limited areas. His biggest single success has been getting his bitch in the White House, but he is a loose cannon and has limited authority compared to Putin's absolute rule, so success has been mixed but Mueller & the rule of law are gradually winning as more of Trump's crime gang are being indicted, have flipped in deals for reduced sentences or are in jail. Crimea and todate Syria have also be notable successes, but the Donbas must currently be classed as a failure.