You don't want offices because of feng shui, you want them because of the positive impact they're going to have on productivity / retention / talent acquisition. And yet their rationalizations rarely include anything but real estate costs.
I just don't get it. If a private office would improve an engineer's productivity by 5%, that's over $1k/month in payroll savings they could put toward their 8x8 square with a door.
Now consider that the actual improvement to productivity vs open offices is probably more like 20%, and that an 8x8 square with a door in commercial zoning isn't even close to 1k/month, and that you're also improving your ability to attract and retain top talent.
But don't worry, we have plenty of room for nap pods and massage chairs.
Also since you're in the UK don't forget about rates (local property taxes that businesses pay in the UK). Once you're beyond a certain size this tax will jump from £50 a month to over £1000.
I did have an office in Oxford for £200/month although this was ten years ago and it was a bit of a dump.