I think aaronizneez makes a fair point and I’d suggest that the times published in the Racing Post do not make allowances for ommitted fences.
The race won by Swings N Strings at Uttoxeter, for instance, shows a winning time only 1.2s slower than standard. Bearing in mind the winner was rated only 86, there’s obviously a discrepancy, and it could prove misleading (assuming of course you didn’t notice the note at the top of the page saying x obstacles had been ommitted).