It would probably not be an offence, however you would be in breach of insurance Ts&Cs for not telling them of a modification, and might be viewed as being in breach of Type Approval.
Basically, your car came with TPMS. Not having that system built into the car available for use - no matter what aftermarket system you may be using (and can you really claim that you ALWAYS use the SatNav based one ?), the system must be shown to be in use at all times - automatically - from startup.
If you had an accident that was due to an underinflated tyre, puncture, or other similar cause and the original in-built system was non-operational then your claim could be refused. That could also cause your insurance to be invalid, which would then be a specific criminal offence.
The above are undoubtedly a highly remote set of possibilities. But someone wins the lottery most weeks, and the chances of that happening are remote too !
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