Max Chat;
I think the ANO is quite clear on this point if you look at 2(a)(ii).
Article 71 states:
(2) For the purposes of this Order:
(a) ‘flight time’, in relation to any person, means all time spent by that person in:
(i) a civil aircraft whether or not registered in the United Kingdom (other than such an aircraft of which the maximum total weight authorised does not exceed 1600 kg and which is not flying for the purpose of public ransport
or aerial work); or
(ii) a military aircraft (other than such an aircraft of which the maximum total
weight authorised does not exceed 1600 kg and which is flying on a military
air experience flight),
while it is in flight and he is carried therein as a member of the crew thereof.
The following is from the introduction of CAP 371 and I think is fairly explicit too:
1.4 A flight crew member is required to inform anyone who employs his services as a flight crew member of all flight times and flying duty periods undertaken, whether professionally or privately, except for flying in aircraft not exceeding 1,600 kg maximum weight and not flying for the purpose of public transport or aerial work. Aerial work includes flying instruction for which the pilot is remunerated. It is also aerial work where valuable consideration is given specifically for flying instruction,
even if the pilot receives no reward.
So if you are subject to CAP 371, you would need to count your TA flying as part of the whole package. This means that flying in your days off could result in the scheme being contravened (ignoring the flying hours, just the days off). Unless your company is very generous with the number of days off it gives you!