I had a look at their website and couldn't make head nor tail of the options. For the UK what set up would you recommend; do you have a link to what you purchased, and what sort of budget would I need?
Key parts of my kit are with suppliers are: (for U.K. and European based people - unfortunately much more expensive than the USA)
PVS-14 with Photonis 4g or Harder Digital Gen 3 white phosphor tube, manual gain and autogating - about £6k with ActinBlack.com (Luxembourg) or nighttec.net. You can buy a cheaper tube, but astronomy is hard on the tubes (due to the filters used and so really I think you have to go for the best to get good results)
TNVC televue PVS-14 adapter - only from TNVC direct in the US. I ordered the televue fonemate and TNVC adapter as well which was worthwhile since I've enjoyed taking phone photos as you can see. Total cost around $250 dollars I think plus import duties. TNVC also wouldn't accept credit card or payment - just direct bank transfer. Unfortunately I don't think there are any other options and its an essential part of the system for us in Europe that can't buy the Mod-3 NV monocular.
Then just two filters really needed - one for nebulae and one for galaxies, clusters, and stars.
I use a 2 inch HA filter (I now use a chroma 5nm but a 6nm or 7nm is cheaper and works well as well) for nebulae from a dark
or light polluted site and a 2 inch Baader 685 ir pass filter for star clusters and galaxies from a light polluted site (unfiltered from a dark site)
55mm televue plossl to get the focal reduction (eg turns my f3.3 Tak Epsilon into an f1.6 system - magic for nebulae). I've also got a 41mm panoptic and a 32mm plossl for extra magnification but this results in higher f ratio so you lose brightness.
NV also gets expensive if you want to look at both large and small objects since in order to keep the f ratio low you need to change telescopes to increase image scale. Hence my purchase of the C11 to try to get some higher image scale on galaxies. I use various size refractors and reflectors with my NV depending on which objects I am looking at.
I've also got an AP photo visual reducer to reduce the f ratio of some of my scopes like the c11 by around 0.75, ie take it down to f3.5 with the 55mm plossl (as per the latest galaxy images above) to try to get even more light (at the expense of less magnification).
Using the monocular at 1x and 3x (ie with a 3x lens separately purchased from actinblack) is also amazing for the fantastic super widefield views you get.You need to get 1.25 filters for Ha and 685 which I have and some adapters from rafcamera.com in Ukraine to fit them to the pvs-14. You do get significant vignetting with the 3x when using the 1.25 filters.
Hope that helps.