If you’re going to be the only shareholder, you only need to issue (allot) one share to yourself.

If the company is going to have more than one shareholder, you need to issue at least one share to each shareholder.

Every share you issue must be assigned a nominal value, which is usually £1. This is the sum that shareholders agree to pay for their shares when they are issued. The nominal value of your shares determines your ‘limited liability’, which is the amount that you’re legally required to contribute if the company cannot pay its debts.