For some examples of RF grounding including problems that can be faced take a look at the following link :-
Flexradio RF grounding
For a brief insight into UK earthing systems the following link explains well :-
Electrical Apprentice - Earthing & Bonding
Some radio Hams wire up the whole shebang and bang in an earthing rod believing "jobs a good'un". Others will go to the fuss of burying multiple run cables under their lawn etc. believing the same......
.....observationally, they got away with it.
Listen to the same Hams when they make transmissions. Whilst running 'barefoot' they sound fine and when they switch on the linears they sound terrible! All sorts of lengthy conversations abound on 160m & 80m surrounding the possibilities of IMD, linearity, etc. etc.
The same with reception, your counterpart complains of S7-8 of hash and can't copy you whilst you look at your lowly S3-4 of hash thinking perhaps there's something wrong with your setup......even though you can hear them well.
Perhaps they have a noise inducing earth connectivity and you don't
For me personally I treat 'RF Ground' as a totally different subject to electrical 'Earth Ground'.
In fact I prefer the 'Counterpoise' method which has been happily utilised for over a hundred years!
Dipoles come with their own 'counterpoise' as it's the other half of the antenna. I've only ever ran an end fed with a suitably long counterpoise successfully and hence my appreciation for the lowly dipole. If sticking a ground earth connection into the back of your rig bounces your signal hash up by several S-points....check how much it actually makes a received signal jump....you may well just be adding noise rather than signal.
Anyway, the links may provide some help and my personal opinions may just start heady debates.
Each to their own.