Your share price must be calculated on a fully-diluted basis. Please see here for more information on what this means.
To do this, you need to take your pre-money valuation and divide it by the existing number of shares, options and convertible loans. It is usually easiest to prepare your cap table before doing this.
As investors invest in £10 increments, you may need to subdivide your shares as part of the completion of your round. Our legal team will give you some guidance on this after your pitch has closed.