I have the opportunity to make a move on the property ladder and am considering various options but don't feel well informed enough to make a decision.  I have a young family and we are comfortable in a nice home but would like a bigger house as I work from home a lot and would like my own study, plus we would like a second child in the 2-3 years.

The options as I see them, are:

1. Sell our current house (3-bed end of terrace) - currently on the market for £375-400k, and purchase a bigger detached house (5-bed, circa £700-800k).  This has been our main focus to date, as it will be a long term family home so I am not overly worried about making profit/loss on the short term.
2. Keep our current house and purchase another 3-bed (£300-400k) home as a buy-to-let opportunity with a 20% down payment
3. Keep our current house and rent it out, investing in a slightly bigger home (4-bed, say £450-500k, detached or semi-detached).

This poses several questions I guess - especially with Brexit fast approaching.

If we are thinking for the long term, what is the best opportunity for us to generate wealth?  Should we buy and let out smaller properties to build a portfolio, or buy a nice big, very modern home of our own?

There is a lot of FUD about Brexit, so if a big dip comes in the market, is it better to buy another property and then sit on it for a few years and make good money?

ARG! What is the smart thing to do?