www.pilgrimways.org.uk/
This website (which is still a work in progress) lists many relatively short pilgrim routes distributed around the Roman Catholic Dioceses of England and Wales each connected to a local shrine and or saint. (The Dioceses of England and Wales constitute a single Conference of Bishops - Scotland is separate in this regard.)
The opening page while acknowledging that this project has a Catholic background states it is "welcoming people of all faiths and none".
A quote from Pope Francis sets the tone:
Whoever they may be
— young or old, rich or poor, sick and troubled or curious tourists —
let them find due welcome, because in every person there is a
heart in search of God,
at times without being fully aware of it.