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The rates of pay were increased at least twice during the war, but from July 1940 to at least March 1944, a Lieutenant Colonel's pay was 43 shillings per day, which is equivalent to about ยฃ110,000 per year in 2017 money. There were additional allowances for family members.
Soldiers with dependents were expected to allocate some of their pay to them, and there was a system for making those payments in the UK. The amount would have been up to the soldier, at least for officers. The balance was available to the soldier, and they would often draw it in local currency if serving overseas.
Source: Hansard report of a question in Parliament, but the OCR has not made a good job of the layout. Conversion by Measuring Worth, using their labour value scale.