Can you provide any advice or recommendations around the Purflo Sleep Tight Baby Bed, this is being sold in NZ as a safe sleep bed (for overnight) sleeping, with apparent endorsement from the UK. If you can provide your thoughts that would be great.

There are a lot of portable sleep spaces on the market, which do not meet the Safe Sleep guidelines, including a number of safety concerns about pods & nests & on how they are used.
These include soft, padded sides & soft base & minimal height on sides.
Product Safety recommends sides of a bassinet should be 300mm high
https://www.productsafety.gov.au/products/babies-kids/kids-furniture/bassinettes

Some of the products are designed specifically for co-sleeping, however the baby is still at risk of adult bedding being pulled up over the baby’s head & face.

Red Nose recommends the safest place for baby to sleep is in a cot that meets mandatory Australian/New Zealand standards.
https://rednose.org.au/article/what-is-a-safe-sleeping-environment
https://www.productsafety.gov.au/products/babies-kids/kids-furniture/bassinettes

Red Nose also recommends to avoid using anything soft or padded in baby’s sleep environment.
Most of the pods/nests/co-sleepers have soft padded (cushioned) sides.(similar to a cot bumper)
Soft bedding is dangerous in a cot and should not be used. Soft bedding includes pillows, quilts, doonas, soft toys and bumpers. Soft bedding may cover the baby’s face and obstruct breathing and/or cause overheating.
https://rednose.com.au/article/at-what-age-can-i-introduce-cot-bumpers-and-pillows

Lullaby Trust, our colleagues in UK, provide the following information about pods & nests:
Pods/nests Pods or nests are a softer type of sleep surface sometimes used instead of or in addition to a mattress, with areas that are raised or cushioned.
When sleeping, babies shouldn’t lie on or have anything soft around them, particularly their heads, as this can cause them to overheat and increases the risk of SIDS.
Soft, squishy materials can also cover baby’s mouth and nose if they are pressed against it.
https://www.lullabytrust.org.uk/safer-sleep-advice/sleeping-products/
https://www.lullabytrust.org.uk/wp-content/uploads/The-Lullaby-Trust-Product-Guide-Web.pdf

This is great information, but you have completely avoided answering this question and it would be good to have a definitive yes or no please as to whether the purflo is safe for sleep.

It is not possible to provide a definitive “yes or no” response to safety of specific products.
However, Red Nose has information, including the response to the original question above, about the potential risks when using any products that create a soft & padded sleep environment for baby.
https://rednose.org.au/article/firm-and-flat-is-safest-for-sleeping
https://rednose.org.au/article/why-is-sleeping-babies-on-firm-surfaces-so-important-and-what-are-the-risks-if-you-dont

Product Safety Australia (ACCC) also provides safety information about product types in their booklet entitled
“Best practice for the design of safe infant sleeping environments.”
P10 to 14 are of particular interest.