Id say the cross will be alright in a downturn champion coz its so close to city centre (its a fine location anyway)
To avoid paying tax on the rental income you could look at buying a section 23 property, you have excellent equity in existing rental property so wouldnt need to raise any further cash from PPR
I wouldnt be in any rush to sell that property C, if your looking to buy an investment Rochestown mightnt be the best option, very high entry costs, yields low unless you get lucky with a corporate let long term