Please feel free to adapt and personalise the following template:

Dear........,

I am writing to express my serious concerns regarding Brexit.

It has become increasingly apparent that the impact of Brexit on the lives and fortunes of ordinary people in our country will be severe - socially, economically and in terms of our standing in the wider world. The Government's refusal to release the full Impact Assessments to the general public, explaining precisely how our economy, security and public services are likely to be affected by our departure from the EU has only deepened my conviction that Brexit will have devastating consequences for the U.K.

I am therefore asking you to support the growing calls for a referendum on the final deal, following the parliamentary vote on the deal in the Autumn, which provides the option to stop Brexit and retain our membership of the EU. It is only right that people should be allowed to vote again, now that the true costs of Brexit have become clear.

Yours.....