It's not condoned by BS7671 but it's advised upon through Appendix 15.
By connecting loads of this type to a ring final, you're chancing that the load current in parts of the circuit may exceed the current carrying capacity of the cable. Obviously, it would require other loadings to be in use at the same time.
The Appendices are informative, not normative so it's just guidance to help design a sound circuit.
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