Thanks to everyone that offered an opion on a suitable laptop. Having visited the Razer Store in London (before lockdown!) I had an opportunity to test a standalone Enscape file I put together on both the Stealth 13 (GTX1650) and Blade 15 (RTX2070).
I was very surprised by how well the GTX1650 ran things. I'll admit, there was some very minor pixelisation when moving around the space but for such a small and well built device, it work brilliantly.
That said, the RTX2070 was so smooth. No lag, no pixelisation and great graphics. They were both priced the same and I loved the samll form factor but went for the Blade 15. The larger screen is very helpful (although I do connect it to a much bigger 49" monitor!) and I can upgrade memory and SSD easily (but so far have not needed to).
I've been using it extensively while being unable to go into my office and use my workstation. So far, I would say it is the best laptop I have ever bought and would recommend it to anyone that needs portability and power.