[Qgis-user] Remove all rings with a polygon

[Matt Travis]

I have a uk postcode layer that in have clipped to the boundary of my
authority and have then used the dissolve function to aggregate these into
postcode sectors. When I do this though there are hundreds of little rings
left over by the vertical postcodes (blocks of flats I presume). I wish to
remove these but don't know how to delete rings apart from clicking on each
one.

Is there a function someehwere i could use (grass?) or do need to write
python script?

Thanks

Matt
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