pls explain cgt reliefs in very simple terms. I seem to be mixing rollover relief and hold over reli

Rollover relief is available when a business sells a qualifying business asset, usually a freehold property used in the trade, and within 1 year before to 3 years after the disposal date invests the sale proceeds in another qualifying business asset. The rollover relief reduces the base cost of the new asset giving rise to a bigger gain when it is eventually sold.
If, however the asset purchased is a depreciating asset (life of no more than 60 years), for example, a leasehold property with a lease of less than 60 years or fixed plant and machinery then rollover is not available but the gain may still be deferred by using holdover relief. The gain is not now deducted from the depreciating asset’s base cost but is instead deferred until the earlier of:
– the sale of the depreciating asset
– the cessation of the business use of the asset
– 10 years
I would advise you read the OT Course Notes and listen to the relevant lectures to understand the use and application of the various capital gains reliefs!