ks was joined in the England starting XV by Leicester colleagues Tom Collett and Jack Cobden as the red-rose side came back from a half-time deficit to make it three wins from four internationals this season following a 14-8 triumph over France and a 15-6 victory over Scotland. England's only defeat came against Wales (21-9).
It was Tonks who got England on to the front foot on Saturday, grabbing the first try in the opening stages of the second half.
A penalty by Rob Miller put England 6-5 ahead and then Tonks struck. A line-out eight metres from Ireland's try-line saw scrum-half Dave Lewis recycle the ball out into midfield to Miller and then Luke Eves. Bristol centre Eves made some space to set up Tonks to score. Miller converted, putting England 13-5 up and from there they were never bettered.
England head coach Chris Kibble said: "It is a great feeling to finish this festival with a solid performance and on a winning note. Although the players defended well in the first half, they knew they had to up the tempo. They did just that, giving us the opportunity to get front-foot play and that resulted in two very well-executed tries. All the players have learned a lot from this experience and have come on leaps and bounds."
England U-18s Six Nations Festival team
15 Greig Tonks (Nottingham High & Leicester Tigers)
14 Charlie Sharples (St Peters High & Gloucester)
13 Jack Cobden (Wyggeston QEI College & Leicester Tigers)
12 Luke Eves (Colston's Collegiate & Bristol Rugby)
11 Henry Trinder (Hartpury College & Gloucester Rugby)
10 Rob Miller (Keswick School & Newcastle Falcons)
9 Oliver Frost (Bromsgrove School & Worcester)
1 Ben Moon (Ivybridge Community College & SWERA)
2 Tom Collett (Wyggeston QEI College & Leicester Tigers)
3 Alex Brown (Dulwich College & Saracens)
4 Graham Kitchener (Adams Grammar & Worcester Warriors)
5 Calum Clark (Barnard Castle & Leeds Tykes)
6 Carl Fearns (Sedbergh & Sale) (captain)
7 Jacob Rowan (Bradford Grammar & Leeds Tykes)
8 Mike Macfarlane (Royal Grammar Guildford & NEC Harlequins)
Replacements
16 Joseph Marler (Sussex Downs & NEC Harlequins), 17 James Clark (London Irish), 18 James Currie (Millfield & Bath Rugby), 19 Courtney Lawes (Moulton College & Northampton Saints), 20 David Lewis (Ivybridge Community College & SWERA), 21 Mike Stanley (Oaklands College & Saracens), 22 Tom Sargeant (Royal Grammar Guildford & NEC Harlequins), 23 Ben Williams (Bryanston School & Bath Rugby), 24 Sebastian Stegmann (Cranleigh School & NEC Harlequins), 25 Mark Davies (St Peters High & Gloucester Rugby), 26 Dan Williams (Ivybridge Community College & SWERA)
Ireland U18
1 Patrick McAllister (Royal School Armagh), 2 Peter Kelleher (PBC Cork), 3 Adam Macklin (Methodist College Belfast), 4 James Sandford (Royal School Armagh), 5 Stephen Mahony (St Michael's College), 6 Alex Byrne (St Michael's College), 7 Brian O'Hara (PBC Cork), 8 Peter O'Mahony (PBC Cork, captain), 9 Matthew Healy (Gonzaga College), 10 Ian Madigan (Blackrock College), 11 Andrew Burke (Crescent CC), 12 Shane Gahan (Gonzaga College), 13 Richard Reaney (Royal School Armagh), 14 Robert Johnson (Blackrock College), 15 David Kearney (Clongowes Wood College)
Replacements
16 Thomas Sexton (Belvedere College), 17 Nermin Lovic (Belvedere College), 18 Felix Ross (Kings Hospital), 19 Patrick McGowan (Ballymena Academy), 20 Sam Bell (Methodist College Belfast), 21 Ronan O'Mahony (Castletroy CC), 22 Chris Nolan (CBC Cork), 23 Mark Atkinson (Grosvenor Grammar), 24 Ricky Andrew (Ballymena Academy), 25 Kyle O'Dwyer (CBC Cork), 26 James Ryan (Rockwell College)
