This week, is potentially a reasonable time to buy ( if the price is right ) stock / shares in UK Companies that trade heavily with the EU , as the uncertainty of a Brexit deal may have made them more affordable , and if there is a deal done, their value may rise rapidly, , giving you the opportunity to sell and make a fast buck.?
But there again, the stock value of these companies may not stop dropping , even with a deal, so you may be putting your investment at very high risk?
Clearly it is a gamble , and it always has been, and one which you may not wish to take, especially after taking essential professional advice.
All I would say is, if you want to gamble with your savings, spread your bets, so that any losses are diluted- a wide portfolio is probably the best for a first toe in the Water – and be prepared to make losses.