A cutler by trade, Toker came from a family which had been resident in the Liskeard region since at least the thirteenth century, and his career seems to have been strictly a local one.
As he had not previously become prominent in either royal administration or in the service of the duchy of Cornwall, it may be assumed that it was his local standing which led to his election to the 1426 Parliament. Within a few years of his spell in the Commons, Toker and his parliamentary colleague John Colys found themselves in serious jeopardy: a jury at sessions held in Somerset in January 1430 presented that in September 1422 they had been guilty of clipping coins and passing the resulting metal on to known counterfeiters at Wells. They were fortunate that on this occasion the wheels of the judicial system moved with uncharacteristic speed and the same August they were tried and acquitted at the Somerset assizes.
The serious nature of the charges against him did not preclude Toker from serving as a royal tax collector in Cornwall on no fewer than five separate occasions between 1429 and 1437, and in 1435 he was appointed reeve of the duchy of Cornwall manor of Liskeard, within which he held land. He had relinquished this latter office by the time he attested the Cornish shire elections at Lostwithiel in December 1436, so we can only speculate whether his renewed activity as a tax collector earlier that year had caused him to take a fresh interest in parliamentary affairs. Indeed, such was the experience of the men charged with levying subsidies in the localities that they might well have wished to influence the negotiations of the Commons. In June 1437 the Cornish collectors, including Toker, reported to the Exchequer that the borough of Truro was so badly decayed that they had been unable to levy the required sum of money. The cash-strapped Westminster authorities were reluctant to accept this excuse, and ordered an inquiry by the justices of assize.
