Southend-on-Sea according to the
Contact Us link on their website:
Titan Pro Ltd
7 Murray House
222 Eastern Esplanade
Southend on Sea
Essex
SS1 3DN
That suggests their geographic number starts with the STD code 01702
However, Google Street View shows the address to be a block of residential flats (the seafront location indicates they are not inexpensive) so, clearly, it is a correspondence address only.
On linkedin, Charlie Abbott states his is the business owner. OTOH, he appears to have 3 personalities thereon.