Well, looking on the UCAS site, for single honours Music:
Aberdeen: just says that musical skill 'will be assessed at interview'.
ARU: yes
Bangor: W300 - no
W302 - no
Bath Spa: no, just 'good standard of vocal/instrumental performance required'.
Birmingham - yes
Bristol: no, but 'some fluency at piano expected'.
Brunel: no
Cambridge: no
Canterbury Christ Church: no
Cardiff: W300 - no
W302 - no
University of Central Lancashire: no, though audition is required
Chichester: no, though audition is required
City: ABRSM Grade 7 unless wanting to to advanced performance at Guildhall, in which case grade 8
Colchester: no, though audition is required
Dartington College of Arts: no
Durham: no
UEA: no
Edinburgh: ABRSM Grade 7, grade 5 piano
Glasgow: W300 - no
W302 - no
Goldsmiths: ABRSM grade 6 (!)
Huddersfield: Students doing performance - yes
Hull: W300 - no, AMRSM Grade 7
W302 - Same
KCL: yes
Kingston: no
Lancaster: W300 - yes
W302 - yes
Leeds: yes, distinction required for BMus
Liverpool: no, ABRSM Grade 7
Liverpool Institute for Performing Arts: no
Manchester: yes, grade 8 distinction
Middlesex: yes
Napier: no
Newcastle: W300 - yes, for performance route
W304 - ditto
Northampton: no
Nottingham: no
Oxford: no
Oxford Brookes: no
Plymouth: no if you have a Music A-level, otherwise grade 6
Queen's University Belfast: no
Roehampton: no if you have Music A-level, otherwise yes + grade 7 music theory
Royal Holloway: yes
Salford: no
SOAS: no
Sheffield: no
Southampton: yes
Strathclyde: no
Sunderland: no
Surrey: W300 - no
W301 - no
Sussex: no
Thames Valley: no
Ulster: no
Wolverhampton: no
York: no