@M0YNG Hi, this is an interesting but difficult question. Several Ham Books have been written about verticals. E.g. Covan/Orr Vertical Antennas. It depends on which bands u plan to cover. If these are bands from 20 m up it is no Problem to use a vertical dipole - without radials- but u can tilt one leg of it. The GP is a DX ANT. and is not a good choice for QSO in Britain.
A ground spike generally is recommended for lightning protection but it is NO hf-ground! Vy 73