Just a quick question, is there any point in me spending £30 and sending off for his service record from Army Historical Disclosures or is The National Archives the way to go? I don't have any exact dates for his service. Alternatively would the regimental museum be a port of call

EDIT duh! Thanks to Picea looked at the RE website and the answer is here:
http://www.remuseum.org.uk/rem_res_service.htm