Unfortunately my only option at present is FTTC via landline and I am with TT.
Oh, right that explains why you're on analogue. I first thought you had BT, since that's how you addressed it in your original post. But what you mean is Openreach! It is Openreach who are responsible for the line faults.
Being on FTTC doesn't stop you from getting Digital Voice as I am on BT FTTC and my migration happened over 2 years ago from TalkTalk Analogue to BT FTTC.
I'm not sure if TalkTalk can help you migrate from Analogue to Digital Voice but it may be worth a shot trying to get them to migrate you. Now they might tell you that you must renew your contract to migrate you to DV. If that's the case then you can switch to a new ISP like BT and it will offer you to switch to Digital Voice. You'll receive a free alexa phone, which you can wirelessly connect to your router and that's how you can make phone calls or connect the phone to the telephone port.
The TalkTalk router does not have a telephone port and may require an adapter. But BT Smart Hub 2 does. So you have to join an ISP that has a router with a phone port so you can connect your old vintage phone to the router for phone calls to work.
This may naturally resolve your problems for good. If you still have drop outs even after that then the problem is somewhere else on the line. But I expect it to solve your problem.
If you're not having general broadband drop outs and they only occur with the phone then DV will completely solve these problems!