A few points:
If you have any winds at all, you WILL need to have posts or a pole sunk into concrete buried in the ground. How deep and large the footing(s) need to be depends on how large the surface area of your panels and max wind speeds. You can find resources on the web to do the exact calculations to minimize footing size or you can just overengineer - using deeper holes and more concrete than you think you need. Concrete is cheap and digging holes is labor intensive but inexpensive.
You have 2 choices - Pole mount or ground mount with several posts. Single large footing versus several smaller footings. I have done both.
Pole mount has the advantage of taking up a smaller footprint and potentiallly easier adjustments of array angle (if desired). Pole mount will mean buying a large steel pole (likely 6" diam. schedule 80 for your 6 panels) and metal racking hardware. For the hardware there are commercial systems that are very well engineered but expensive - but you can also DIY. If DIY you can make it simpler by purchasing a premade bracket
like this (Search UK ebay site for UK options).
If ground mount - you can use several treated wood posts sunk in concrete footers. Use bigger wood than you think you might need - I know someone whose 4" x 4" wooden posts were snapped off in high winds. For your 6 panels - a 2x3 panel array supported by 4 4" x 6" treated posts (or metric equivalent) each sunk into a 3' deep x 1.5' post hole filled with concrete would likely suffice - unless if is high off the ground, in which case leverage would require more posts. Array can be mounted on large diameter treated lumber rails or metal rails. Avoid direct contact of dissimilar metals or metal with treated lumber.
You can find some good (and bad) examples of DIY mounts by doing a search on
the NAWS forum. There are some UK based solar forums as well.
Below are pics of my 2 current arrays. My pole mount required a very large concrete footing because it is moist soil. It has a 2 axis tracker. This was put in several years ago before PV prices dropped so at that time the extra expense of a tracker made sense.
My second, larger array is on a wood shed. I initially planned to just build a large ground mount - but considering the very high wind gusts we get here - I decided taking the time and expense to build a large shed meant less forces directly behind to panels and the added bonus is a large shed! It is supported by 9 4x6" treated posts - each in 3' x 1.5' concrete filled holes
Next summer I plan a 3rd large array. It will be a pole mount array without tracker.