Just done a clean install of W10

NavyLCDR said:

During the install, just do what @Bree instructed. Boot from the USB flash drive. Select the custom install option. On the next screen, highlight each partition and click delete. Once you have only 1 large unallocated space left, highlight that and click next. There is no need for third party software.

Cracked it! I now just have the two partitions. Thanks to all for your input.