Dear Sir,
We have tried best to review the requirements but due to limitations (i.e. no code access and not much discussion about every requirements closely), we are little uncertain about complete review and hence, estimation.
So, better, we do not proceed with such limitations and commit you something, we are uncertain.
Though, If you wish, we can always give a try and work along with you on hourly basis (i.e. GBP10/hour, where you can pay us for 10 hours every time [release in advance] and see, how many things we will do it for you and so on. When we reach to 10 hours, you can purchase another slot and likewise. We will keep justifying hours too. Again, we will always give a best and close TRY but we DO NOT COMMIT anything at this stage.
Let us know.
Many thanks for your support and time.
Best regards,
- Prakash
WeTheDevelopers