They aren't tiny in my opinion.
150gbp
You get 195ml of perfume + 20ml of perfume oil + 88ml of body mist + candle
I don't know what oil 10ml is 56gbp for example
100ml of Mojave Ghost would set you back 220 gbp or 2.2gbp per ml, and that's based on big bottles which are best value.
Paying 150 for 195ml of perfumes, 20ml of oil and 88 of body mist and a candle is good deal if you like the options. if you count the oil as perfume as they cost similar or more, and even if you just add 15 ml instead 88 for the body mist - 230ml for 150 gbp comes about 65p per 1ml of perfume. You won't get that type of selection for this little.
Provided you like the options, the sizes are good imo. I wouldn't call them fillers or samples, I have looked Harvey NIcks and I think the total is also about 190ml Penhaligons double the price gives 140ml perfumes total, last year Jo Malone 156 ml also more then double the price. Jo Malone had 1 30ml and 14 9ml.
I think Harrods is the one that is bigger total ml but very oud heavy. I feel sizes are good, I often purchase 10ml travel size before committing to full size as I have good few.