Peter,
If you are going to get wider rims put on to your centres have a careful think about whether 8" is wide enough. I did a check of various tyre brands around 305mm - 315mm/12.5" wide (you will need to get this wide to get the required 35-36" (900mm) rolling diameter) and most of the listings require rims larger than 8". I know a lot of people do put these tyres on 8" rims but I do not know enough to know whether this is good or bad other than to investigate a bit more.
Likewise, you could just stay with your current rims and put Michelin XZL 255/100/16 on. They cost a lot but wear well and look good on a 101 and you save the cost of rim widening.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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