What you do need to be wary of is the not the octane rating but the presence of Ethanol in the fuel.
Currently most of the petrol supplied in the UK is E5 and contains 5% ethanol. It is due to move to E10 in the near future. Unlike most other countries there is no requirement in the UK to show the % or even the presence of ethanol in petrol so most people are unaware that it is even there.
Some of the premium grades are ethanol free but this also varies depending on whereabouts you are in the UK.
The ethanol itself will attack the older types of flexible fuel lines but it is also hygroscopic and will absorb water which can cause corrosion of the metallic components in the fuel system. The ethanol can also oxidise on standing to form ethanoic (acetic) acid which is also corrosive and can damage carburettor bodies and brass jets.
Here's a list of biofuel safe materials.
If you cannot be sure of the fuel supply the best thing you can do is to use a fuel additive such as Frost Ethomix and replace all the rubber hoses with biofuel safe materials.
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