I would say, rather buy a few basic good quality tools. A good set of screwdrivers, in Chrome Vanadium steel, is the best investment you can start with. The DIY chains and supermarkets often have large sets at a very modest price. Don't buy any that don't say Chrome Vanadium.
You can also get a set of pliers and pincers. Again go for the alloy steel ones. Carbon steel is NOT GOOD ENOUGH. They are cheaper in sets than individually. If you can get the ones with red and yellow insulated handles they can be used for certain electrical work, and are more comfortable. However the insulated screwdrivers are more difficult to use than plain ones, so I would avoid them for the moment.
Ultracheap sets of tools are available, often labelled as containing vast numbers of items. They are usually rubbish, and are packed up with stuff you will never need. anything with the Rolson name on it is rubbish.
Next you will need a rechargable drill with hammer action. I got an 18volt one from
Wickes. It will not be as good or as powerful as a more expensive one, but is pretty essential for DIY work. It will probably come with a starter set of Twist and Masonry bits, which you will also need. There will be some on sale after Christmas as they are popular presents.
And a claw hammer and a torch.
And some plasplugs (I always use the brown ones, you do not need a big range) and some screws. I mostly use BZP countersunk 35mm x 4mm but it is more economical to buy them by the hundred in the sizes you need, than a pack with half a dozen of lots of sizes. The small plastic bags are a very expensive way to buy.
That will probably use up your £100.
You can get other tools when you need them.