I know little about the Hawtree dynasty but am interested in MacKenzie's work in England and during my researches found this for Bolton Old Links on the club's website:
1966 - Messrs. Hawtry and Son, Golf Course Architects, surveyed the lay-out of the course to consider the possibility of reducing the physically tiring aspects of playing holes, such as the uphill 6th and 15th, against the prevailing wind and also the practicality of incorporating within the course any of the following areas of land owned by the Club:-
5.5 acres to left of 10th hole
10.5 acres to left of llth and 12th holes
4.37 acres to left of 13th hole
2.2 acres beyond 14th and 5th greens
3.2 acres to left of 16th hole, and a small area of land (quarry) to left of 18th green.
Following an inspection of the course the Architects reported that "the balance of advantage seems to us to rest with the present arrangement, though it would be desirable to consider lengthening the 12th hole to some 290 yards" and that "the future development of the course should be very much confined to the lay-out as it stands with only marginal changes. It has been well designed in relation to the contours and boundaries, any extension of the latter only producing changes as opposed to improvements".
Thereafter, the 12th hole was extended from 241 yards to a par 4 hole measuring 369 yards but the new green proved unsatisfactory. In 1972, the green was reconstructed, stone available from the demolition of Langshaw Fold farmhouse and outbuildings adjacent to the 16th green, previously tenanted by the Club Professional, providing the base for the elevated rear part of the new green. "
So basically they were invited to make lots of money messing around with MacK's work and declined.
Good for the Hawtrees.