If the cost is "less than 1,700 pounds" for this equipment, what is the quality going to be like? Usually, when you cheap out, stuff will crap out just when you need it most. Items costing "significantly more" often last significantly longer or produce significantly better reception (or both).
It depends. They have probably done a deal via a brother with connections. One of the biggest independent online AV retailers in the UK is owned by Witnesses for example. The main thing that monitors are designed to do at extra cost is work 24/7. Halls don't need this so you can get a decent screen from a decent manufacturer, bearing in mind there are only a handful of factories producing all the screens in the world anyway.
As for UHD, I can't see anything in the letter about that. Regardless, the videos will almost certainly be produced in 1080p, probably 4K given the hardware to do this is not that expensive now and it's one area where the borg never skimp. Many congregations download the material to avoid streaming issues so they can download at 1080p HD at their leisure.
One thing I do agree with is the hypocrisy of yet again influencing congregations to dip their hands in their pockets when they would criticise an individual for doing so AND after having nicked all the cash anyway.