Those figures are crazy.
I wouldn't cut things out I would go through and see how the figures are calculated.
1. Architect at 9% of cost is very high, is the architect expecting to be paid more due to the higher budget? I negotiated a fixed price based on the budget costs. The cost is much more now but the price is the same, why should I pay the architect more if I decide to spec nicer windows for example.
2. £10000 for underground drainage seems v high, it is 2/3 of the foundation costs.
3. £27,700 for windows. My triple glazed windows cost only twice that in a house more than 5x the size.
4. £70-80000 for the frame, £440 a square metre is nonsense.
5. £20400 for electrical, again I am only about 50% more for a way larger house.
On the other hand some of the fittings and finishes numbers may be too low but they are much smaller numbers.
Get some quotes, look on the internet, ask him for a refund, he doesn't know what he is talking about.