Then just add as many users (seats) as you want at £30 each
So, for example, a standard subscription (£50 per month) with one additional seat would be £80 per month. For three additional seats on this plan the total cost would be £140 per month.

So, for example, a standard subscription (£50 per month) with one additional seat would be £80 per month. For three additional seats on this plan the total cost would be £140 per month.