Defender 90 TD5 Flat Spot

Recently had a service at Landy 'Specialist' and now have two problems. Used to travel up hills with no problems but now she loses power and slows from 60 to 45 whereas she used to be able to accelerate up hill to 70+ if needed. Also now have flat spot when accelerating on motorway. You can put you foot down at 65 no prob but if you want to boot it she just sticks at the same speed or even loses speed.
No prob prior to service and they say they can't find any fault - usual attitude.
Any ideas guys?
Coincidence or something they have done?
No hisses or strange sounds, nothing new there.

check the wastgate is free to move use some grips and wd40 and push/pull it, they can stick

johnlad said:

check the wastgate is free to move use some grips and wd40 and push/pull it, they can stick

Click to expand...

yeah it was a bit stiff - hopefully that was it. Going for a run this afternoon and will let you know. You learn something new on here every day. Never had a problem with the turbo area before. Thanks for the help

johnlad said:

check the wastgate is free to move use some grips and wd40 and push/pull it, they can stick

Click to expand...

Just had her out for a spin; working well then sluggish again. Pulled up and after liberal amounts of WD40 and a few more push pulls it seems to be okay now; went up hill fine. Will keep an eye on that and maybe thrash her a bit more. Endless traffic snag ups around here and average 25-45 mph (even on 60 mph roads) this time of year due to holiday makers. Probably came to the front because I have been to visit friend in Sheringham 4 times this week - good run out. Going again Sunday so that will be a good test.