Please read the footnote of the latest RSGB plan - UK Ops are requested not to use the overlapping section with the International WRC15 Band for local UK calls.
This is a mess and the sooner that Ofcom issue the WRC15 band IN ADDITION to the existing frequencies and the RSGB UK Only bandplan is changed to fit, the better.
The RSGB page actually states ALL MODES for 5354-5358KHz - but this page doesn't mention digital modes at all in the chart.
I know I have seen in a spreadsheet/PDF from the RSGB a plan that specifically lists digital modes and these are in another Bandlet that overlaps with WRC15 - that problem could be resolved by moving the digital modes section up to the top of the bandlet that it's currently taking the bottom half of and therefore out of the overlapping area with WRC15.
Of course it is totally valid to run digital modes or CW or SSB in the WRC15 bandplan "all modes" section, when communication outside of the UK is wished for.
Like I said, it's a mess and will stay that way until the whole of the WRC15 band is also allocated to UK amateurs.
OK, I found that other data modes segment - it's specified in the band plan document and indeed printed in this month's RadCom magazine - page 38 second column.
5.362 - 5.370 - Digital activity in the UK.
Lower in the same text, footnote 4 states "Contacts within the UK should avoid the WRC15 allocation if possible."
That "if possible" is superfluous text - if the primay user wanted to use any 60m frequency that you were operating on, you would move, so there is no valid reason that using another frequency is not possible.
In any case, these two lines in the same document are in conflict with each other - one says a range of frequencies that overlaps with the WRC15 frequencies should be used for UK comms (digital) and the other line says to avoid UK contacts on WRC15 frequencies!! - I guess someone missed this error in validating the RSGB Bandplan 2017 before releasing it!
However this problem is easily resolved by allocating 5,366.5 - 5,374.5 as the UK digital modes area. In fact for weak signal/narrow bandwidth digital modes such as JT65, 5366-5366.5 could be assigned as well and be 100% in-line with the IARU band plan.
As more and more countries get the 15KHz WRC15 band, there will be the need for communication between them and the UK, so this issue is important. It's a shame that more time wasn't spent on the recently released RSGB Band Plan - but then again, they could be thinking that 60m in the band plan will have to change when the UK get the 5351.5 to 5366.5 KHz band!!
In the Interim for SSB, the only common (not out of band) frequencies are 5354, 5355, 5362 & 5363 KHz. Of course these are either/or either 5354 or 5355, 5362 or 5363. frequencies 1KHz apart don't work too well with 2KHz+ wide modes!
If we want to set a "standard" for SOTA interworking between WRC15 and UK stations, I'm happy to take your suggestion of 5354 rather than 5355 (to avoid some of the JT comms). It's probably better to go with 5362 rather than 5363 as the second option to avoid being too close to the weak signals area in the IARU Band Plan.