There is a Gov.UK website that contains information and advice for visitors to the UK regarding the impacts of Brexit. The site includes information on what happens under both Deal and No Deal scenarios. The information is being updated on a regular basis so it is keep an eye on the page as the advice changes with the political situation. https://www.gov.uk/guidance/visiting-the-uk-after-brexit
Visit Britain's analysis of the Q3 IPS figures contains useful information on what is happening in European markets. The figures are six months old and the factors associated with increases and decreases are not solely attributable to Brexit, but it does give a flavour as to which markets seem to be holding up (eg., Sweden and Spain) and which ones seem to be affected (Germany and the Netherlands).