Have UK exports (goods and services) to Ireland declined in value since 2011?
The ONS Balance of Payments Pink Book gives the following figures for UK exports to Ireland (£million).  The figures in Euros would be different, as would Irish reporting of the numbers, but there seems to have been a sharp drop in services exports from 2012 to 2013.

2016 data is due to be published in October 2017, though trade in goods numbers may already be available

 £m     Goods Services  Both
CDID    QDJJ    FYVJ    LGIA
2011    18223   11475   29698
2012    17234   11615   28849
2013    18592    8780   27372
2014    18104    9288   27392
2015    16764    9321   26085