Question: What is the club's crest of one of the football clubs Stewart Mell played in?

<P0-S0> Association football is the national sport in England, where the first modern set of rules for the code were established in 1863, which were a major influence on the development of the modern Laws of the Game. <P0-S1>  With over 40,000 association football clubs, England has more clubs involved in the code than any other country as well as the world's first club (Sheffield F.C.), the world's oldest professional association football club (Notts County F.C), the oldest national governing body (the Football Association), the first national team, the oldest national knockout competition (the FA Cup) and the oldest national league (the English Football League). <P0-S2>  Today England's top domestic league, the Premier League, is one of the most popular and richest sports leagues in the world, with six of the ten richest football clubs in the world. <SEP> <P1-S0> Non-League football describes football leagues played outside the top leagues in that country. <P1-S1>  Generally it describes leagues which are not fully professional. <P1-S2>  The term is primarily used for football in England, where it describes football played at a level below that of the Premier League (20 clubs) and the three divisions of the English Football League (EFL; 72 clubs). <P1-S3>  The term "non-League" was commonly used well before 1992 when the top football clubs in England all belonged to the EFL; all clubs who were not a part of the EFL were therefore "non-League" clubs. <P1-S4>  The term can be confusing as the vast majority of non-league football clubs in England play in a type of league. <P1-S5>  Currently, a non-league team would be any club playing in the National League and below and therefore would not play in the English League Cup. <SEP> <P2-S0> Stewart Albert Mell (born 15 October 1957) is an English former professional footballer who scored 30 goals from 145 appearances in the Football League, playing for Doncaster Rovers, Halifax Town and Scarborough. <P2-S1>  He began his football career as a youngster with Hull City, played non-league football for Appleby Frodingham, Burton Albion, Boston United and Goole Town, and was a member of the Scarborough team that won the 1986–87 Football Conference to become the first club automatically promoted to the Football League. <P2-S2>  While a Burton Albion player, he was capped for England at semi-professional level. <SEP> <P3-S0> Boston United Football Club is an English football club based in Boston, Lincolnshire. <P3-S1>  The club participates in the National League North, the sixth tier of English football. <P3-S2>  The club is known as 'the Pilgrims' in reference to the Pilgrim Fathers, who left England and sailed to North America and founded Boston, Massachusetts. <P3-S3>  The club's crest, the pilgrim fathers' ship 'The Mayflower', is also a reference to them. <P3-S4>  The club's traditional colours are amber and black. <P3-S5>  Boston's neighbours include Lincoln City, Scunthorpe United and Grimsby Town. <P3-S6>  The club is one of only 12 in the country to run a Centre of Excellence, provides a Study Support Centre and is also the basis of the 'Boston United Football in the Community Scheme'.