Unexpected behaviour of Camel Simple expression

Long time lurker - first time poster! Please be nice :)

I have a very simple camel route:

<from uri="timer://foo?period=1000橪;repeatCount=1" />
<process ref="populateMap" />
<log message="SIMPLE SPRING: INSERT INTO SOMETHING
(${bean:myeval?method=eval(${body[VALUE_ONE]})},${bean:myeval?method=eval(${body[VALUE_TWO]})})"
/>
<process ref="simpleExpProcessor"/>
<log message="${body}" />
<log message="EXPECTED: INSERT INTO SOMETHING ('value','Thing (with
brackets)')" />

The populateMap bean creates a map as follows:

LinkedHashMap<String,Object> map = new LinkedHashMap<String, Object>();
map.put("VALUE_ONE", "'value'");
map.put("VALUE_TWO", "'Thing (with brackets)'");

The log output is:

[pache.camel.spring.Main.main()] SpringCamelContext INFO Apache
Camel 2.13.3 (CamelContext: camel-1) started in 0.282 seconds
[mel-1) thread #0 - timer://foo] MyEvaluator DEBUG
evaluated : value
[mel-1) thread #0 - timer://foo] MyEvaluator DEBUG
evaluated : 'Thing (with brackets
[mel-1) thread #0 - timer://foo] route1 INFO SIMPLE
SPRING: INSERT INTO SOMETHING (value,'Thing (with brackets)
[mel-1) thread #0 - timer://foo] SimpleExpressionProcessor DEBUG INSERT
INTO SOMETHING
(${bean:myeval?method=eval(${body[VALUE_ONE]})},${bean:myeval?method=eval(${body[VALUE_TWO]})})
[mel-1) thread #0 - timer://foo] MyEvaluator DEBUG
evaluated : value
[mel-1) thread #0 - timer://foo] MyEvaluator DEBUG
evaluated : 'Thing (with brackets
[mel-1) thread #0 - timer://foo] route1 INFO INSERT
INTO SOMETHING (value,'Thing (with brackets)
[mel-1) thread #0 - timer://foo] route1 INFO
EXPECTED: INSERT INTO SOMETHING ('value','Thing (with brackets)')

Am I using the simple expression in the wrong way? As you may expect I am
attempting to build SQL queries/inserts using simple and the results are not
quite as expected.

Many Thanks,

Stu.