Capital allowance during break in trade

My client is a a joiner and claimed capital allowances on his tools introduced to the business last year.  He continued to trade until August 2011 when he got a paid job for a short time, then recommenced self employment in April 2012.  I'm reasonably happy that he hasn't permanantly discontinued his trade and therefore balancing adjustments shouldn't be made, but it doesn't seem right to claim a full year's CAs.  Should I just time apportion the claim for the period of trade?