The Authority may wish to consider the suitability of operating from Ad-Hoc sites at night or in poor met conditions without proper approved met facilities at the point of departure.Police a/c operate from both airfields and heliports, but for a long time now it has been a requirement to have approved wx facilities at all these bases, I always found the finger held up to the wind less than satisfactory,at night when there is full cloud cover and the site is in trees,studying the nearest metars and tafs indicate the wx but still do not accurately indicate local conditions, whilst driving to a properly regulated site may be slightly inconvenient to the very few, it would provide a much needed additional safety to the public.
Police aircraft are classed as Public Transport flights and understandably operate under fairly strict rules, essentially to a similar level as must airliners operating from an airfield.
Privately operated aircraft do not have to comply with many of those quite strict rules, imho rightly so, in the same way that the government should not step in and tell you exactly when, how and from where you could operate your private car or motorcycle. After all, there are many fatal road accidents every day in UK and no-one asks for more regulations in that respect, such as not driving in bad weather. We are not living in a Draconian state quite yet; let's hope things continue to be so.