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Are there any catches with interest from banks?  Is this interest “too good to be true”?
The 1.09% is per year, not per month, so you will be getting about 1K per year just for sitting around on your backside. Some important things. It is almost certain that you can earn a better interest rate elsewhere, if you are prepared to leave your 100K untouched. For example, even in Natwest you can earn 3.2% over the next year if you buy a fixed rate bond. For 100K that is certainly worth looking at. Or maybe put 90K in a fixed rate bond and leave 10K in an instant access account. Taxes should not be a problem since you can earn around 7K before you start paying taxes. However be aware that in the UK most bank accounts deduct tax at source. That means they send the tax they think you should have paid to the government, and you then have to claim it back from them. Accounts for young people may work differently. Ask your bank.