My broker OANDA sent me this just now, I trade with 10:1 leverage and wide stops so I think I will ignore it. That said I might move my stops to break even before that date on my GBPUSD short.
Due to the anticipated volatility caused by Brexit, price movements may be significant. At market close on 12 October 2019, to help ensure you are more insulated from such potential movements, we will be lowering the maximum leverage available on the following instruments:
Temporary maximum leverage 30:1
GBP/CAD GBP/NZD GBP/CHF
GBP/HKD GBP/SGD XAU/GBP
UK 100 UK 10Y Gilt
These adjustments are of a temporary nature, and former leverage levels will be restored as soon as possible.
Please be aware that whilst the following pairs are not affected by the temporary leverage changes, they could be reduced to 30:1 leverage due to any spike in volatility, any substantial increase in GBP traded volumes or market risk with little or no notice:
GBP/USD GBP/JPY GBP/AUD
EUR/GBP
As a result of this change you may need to close trades or add funds to your account or risk a possible margin closeout if you currently have open position(s) with higher levels of leverage and do not have enough funds in your account to cover the increased margin requirements.