Postgresql - Timezones when date range crossses into BST

Question

I have a very simple table that contains a start_date field (timestampz) that stores a UTC datetime value. I need to return the dates contained in the table, adjusted for British Summer Time(BST), but the problem i'm having is that AT TIME ZONE BST adds 1 hour to UTC dates irrespective of their value; If the date happened in February (before BST started), the UTC value is the correct value. If the date value is from March (after BST started), then the UTC value needs +01 added to it.

Table Data

2014-02-16 00:00:000+00
2014-04-16 00:00:000+00

SELECT start_date AT TIME ZONE 'BST' from t1 

adds + 01 hour to both values

2014-02-16 00:01:000
2014-04-16 00:01:000

Is there a simple way to achieve the following?;

2014-02-16 00:00:000
2014-04-16 00:01:000

Answer 1

BST is by definition UTC+01:00. So it works as expected. Use Europe/London to get results you want.