Yep @MrsMorrisey - mine 'could have been' about the same delay from surgery to Rads.  It was Mid Jan for surgery & I finished my rads the week of Easter (end of March) - but I was also given the option of 4 weeks later if I preferred to wait til after my 'holiday' to Norfolk Island which would have brought it in line with your treatment, Mid-late April - my Onc saying it wouldn't make any difference which date i chose ... but I chose to have it done before my trip .... 
Back in 2018 they weren't 'as busy' as they obviously are now up there!  xx
Take care