For £100, you will struggle to get pads and polish in the price as well, unless you go for just one type of pad and one type of polish. An alternative would be to get a rotary polisher (as opposed to a dual action) as they are a lot cheaper, but apparently much harder for the novice to use safely.
If it has to be £100, you can get the Kestrel for £75 or so (autobrite I think), then 1 x polishing pad and 1x light cutting pad, and then probably megs refining polish (80 IIRC). This will give you the ability to give it a light polish, but you will struggle to get major defects out.
Why not save up for a month and get a £140 kit from elitecarcare?