2.5mm radial circuit?
Do you mean central heating boiler or water heater? (I ask because you
mention "loft").
Assming you're using a 16A MCB in your CU and your total max demand is
below this (would have to look up what diversity is allowed - probably
little or none in this situation), then 2.5 sq mm T&E sounds fine,
given a suitable cable installation.
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