Thanks AVB and CM
I have a bit on at the moment but hopefully will have a minute to pull it apart again today.
Yes it was a K10-SDC kit. A bit lower quality then what came out of it.
There is a good possibility (50/50) that I have the gaskets the wrong way around. Let's hope so. I did get the Walbro service manual from an earlier post but never thought to use it when reassembling. If that's not the case I will try CM's diagnosis technique and hopefully post the good news tonight