30a is years away, if ever. Openreach specification for third-party (ISP-provided) includes:-
R.VDSL2.2 The modem shall support VDSL2 Profile 17a as defined in G.993.2.
R.VDSL2.9 The modem shall support seamless rate adaptation (SRA) as defined in Section 13.1 of G.993.2.
R.VDSL2.12 The modem shall support 17MHz Vectoring as defined in G.993.5. This requires the modem to be “vector ready”.
If there was any chance of 30a in the foreseeable future they would have to have it in there, or pay for tens of thousands of replacement modem/routers.
My broadband basic info/help site - www.robertos.me.uk
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UnLim Fibre (FTTC). Sync ~ 56.6/14.1Mbps @ 600m. - BQM
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