Congrats on your first reload. If it were me I'd deposit 150 to get the full amount on offer

. From there we need a bit more info on the t and c's such as any minimum odds (unlikely) or any WR? If there are no restrictions the plain advice is to bet the whole amount of your deposit and bonus, try and lose at the bookie in one go ( keep em sweet and in profit and they'll come back to you with more offers). If there are WR , underlay slightly so if you win at the you will lock in more profit. Oh, finally the odds here are generally poor so don't expect to keep the full £75 on offer