An apparatus comprising: a capacitance touch sensor arrangement configured to have a variable capacitance that varies when a user finger touches the capacitance touch sensor arrangement; and at least one variable resistor sensor integrated within the capacitance touch sensor arrangement wherein the variable resistor sensor has a variable resistance that varies with a sensed parameter; the apparatus comprising an input configured to receive an input signal comprising a time varying component and an output configured to provide an output signal that depends upon both the capacitance of the capacitance touch sensor arrangement and the resistance of the variable resistor sensor, wherein the capacitance touch sensor arrangement comprises a plurality of capacitor cells distributed over an area that share in common the input and share in common the output, wherein the capacitance touch sensor arrangement comprises first selection circuitry configured to switch to direct the input signal to a particular capacitor cell, and second selection circuitry configured to switch to direct the output signal from a particular capacitor cell, wherein the first selection circuitry and the second selection circuitry are configured to be synchronised so that they simultaneously direct the input signal to and direct the output signal from, the same capacitor cell, the apparatus further comprising: processing circuitry configured to process output signals from different areas of the capacitance touch sensor arrangement, wherein each area has an integrated at least one variable resistor sensor, to determine the current capacitance for the different areas and the current resistance for the different areas; and analysis circuitry configured to analyse the current capacitance and the current resistance for the different areas to estimate a contortion of the apparatus by the user. a capacitance touch sensor arrangement configured to have a variable capacitance that varies when a user finger touches the capacitance touch sensor arrangement; and at least one variable resistor sensor integrated within the capacitance touch sensor arrangement wherein the variable resistor sensor has a variable resistance that varies with a sensed parameter; the apparatus comprising an input configured to receive an input signal comprising a time varying component and an output configured to provide an output signal that depends upon both the capacitance of the capacitance touch sensor arrangement and the resistance of the variable resistor sensor, wherein the capacitance touch sensor arrangement comprises a plurality of capacitor cells distributed over an area that share in common the input and share in common the output, wherein the capacitance touch sensor arrangement comprises first selection circuitry configured to switch to direct the input signal to a particular capacitor cell, and second selection circuitry configured to switch to direct the output signal from a particular capacitor cell, wherein the first selection circuitry and the second selection circuitry are configured to be synchronised so that they simultaneously direct the input signal to and direct the output signal from, the same capacitor cell, the apparatus further comprising: processing circuitry configured to process output signals from different areas of the capacitance touch sensor arrangement, wherein each area has an integrated at least one variable resistor sensor, to determine the current capacitance for the different areas and the current resistance for the different areas; and analysis circuitry configured to analyse the current capacitance and the current resistance for the different areas to estimate a contortion of the apparatus by the user. processing circuitry configured to process output signals from different areas of the capacitance touch sensor arrangement, wherein each area has an integrated at least one variable resistor sensor, to determine the current capacitance for the different areas and the current resistance for the different areas; and analysis circuitry configured to analyse the current capacitance and the current resistance for the different areas to estimate a contortion of the apparatus by the user.