Woohoo! She starts, runs and does not leak...!
Many thanks to all those who helped on this forum... much appreciated...
What it was in the end was that new needle was too long (yellow colour), therefore stopping the float from rising as much as it should (needs) to allow a consistent flow.
Changed the needle to a shorter, black one and hey presto! magic....!
Now to change the rusty, grass logged blades.... not looking forward to replacing those and looks like will require the strength of 10 bears to remove...
Thanks again all....
