After seeing Alex's 30 X 30 image stack and suggesting it may encourage others to try stacking short exposures, we hadn't bothered to stack short exposures before only assorted long and short exposures together we decided to give it a try.
We had 10 X 30 second exposures which we had taken on 7th April and hadn't done anything with them.
So we decided to stack them and this is the result Thanks Alex
Pentax ist DL 10 X 30 sec ISO 800
Stacked in DSS Processed DSS & PS7 No Darks or Flats
before and after