The Brexit Affect/Effect

Hello Gents and Gentesses.
Has anyone been giving any thought as to how the whole Brexit saga may effect the LSE?
I've been doing a bit of reading up and remain to draw a conclusion...the financial impact on the UK? Itself may well be considerable given there is currently ( as best I understand) no Brexit agreement with Europe. This means international trading from Britain has no basis to complete the financial exchange.
TBH I'm quite confused by it all.
The reason I raise it here is that by Generalisation, if a country's finances are crippled it usually impacts that country's stock exchange, in this case the LSE, on which, two of DGRs star darlings are listed.
fortunately in these two cases the businesses concerned operate outside of Britain, so I am hoping no affect on their particular shareprice, 
but would appreciate any others opinion to help me formulate my own.

I also want it noted that I have now closed my position on DGR, was unfortunate to be a matter of necessity rather than desire. And i look forward to my circumstances changing such that i can again take a financial interest in DGR. Currently my only ASX investment is with ANW.