I look at those complete toolkits and wonder when I'm going to need an octal ink bb socket, or a 1" headset spanner. I have both of those things, but they are never used as I no longer have the bikes they were designed for. I have flat cone spanners, but no cone hubs.
If pushed I would suggest buying individual tools. I have a mix of Cyclo, Superstar and Fat Spanner, but seriously, I built the last two bikes using Allen keys, 3,4,5,&6mm, a Superstar HT2 socket with a 1/2" drive ratchet, Torx bits in a 1/4 " drive socket, a pair of chain pliers, some ordinary pliers and a rubber mallet. I struggle to think what will be in a £180 toolkit that I need over and above those tools. Unless you count chainsplitters and a couple of screwdrivers for adjusting mechs, but both of those are also in my trail pack. OK I also have seal picks, circlip pliers and sockets for fork servicing, and am in the process of making a bearing press, but will you need that sort of tool out on the trail? My advice would therefore be to replicate the basics, in single purchases. On One and Superstar have some good kit in their workshop sections.