I am at the earliest stages of planning a 6-week route in the UK (see below) Self-supported, solo, averaging 100kms/day on tarmac (I push a measly 125W

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[30 seconds on gMaps -- this is a rough sketch] : The plan is to follow EV12 northbound up to John o'Groats; southbound EV1; improvise across Ireland to Galway; EV2 to Dublin and Bristol; improvise to Bournemouth where I catch a ferry back to the continent.
Would be mid-May to the last week of June.
An alternative for the southbound leg would be to ride the GB divide, perhaps avoiding segments that are more suited for horseback riding
Any suggestion welcome.