Hey!
I use this app called Mode to buy, manage and grow my Bitcoin (by grow I mean earn interest on it while it sits in the app).
If you sign up and open the Bitcoin Jar, or simply buy £100 of BTC, you’ll get £20 for free in bitcoin. Check it out:
https://modeapp.com/referral/MIC681778
Let me know if you need help.
Just to make you aware there is a 99p fee charge when buying the Bitcoin so i purchased £101 so that by taking the fee off it ensures you have purchased £100 worth of bitcoin.
When you sell bitcoin there is a 99p charge so it is better to wait 24 hours to receive the referral amount of £20 in bitcoin so you do the withdrawal in one go if you want to sell all your bitcoin.
Be quick on this offer as it is usually £10 free bitcoin.
Michael.